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Synthetic SAE 10W-40 Dirt Bike Oil (DB40)
Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

Designed to improve the performance of bike and rider.

Engineered to deliver the performance attributes most requested by on - and off-track dirt bike riders, including consistent clutch feel. Consistent clutch feel is the result of 'friction durability', so whether deep into a race or deep in the woods, riders can feel confident that their clutch will perform from start to finish. AMSOIL exclusive advanced chemistry provides outstanding engine reliability for worry-free operation under severe conditions.

Package sizes include:

1-Quart Bottle
1-Quart Bottles (case of 12)

Product Code: DB40 • Brand: AMSOIL




MSDS Data Sheet

Product Details Tech Data Reviews & RatingRelated Videos

Product Applications
10W-40 Synthetic Dirt Bike Oil: recommended for Honda®, Yamaha®, Kawasaki®, Suzuki®, Husqvarna® and other dirt bikes where 10W-40 motorcycle oil is used. Recommended for separate-sump applications such as Honda CRF, and many two-stroke dirt bikes.

Product Application Specs

  • API SG, SJ, SH, SL
  • JASO MA

Product Description
AMSOIL INC., the premier manufacturer of synthetic motorcycle lubricants, focuses on improving lubricant performance so riders can focus on improving their performance on the trail or the track. That's why AMSOIL is the Official Oil of Monster Energy Supercross, AMSOIL Arenacross, AMSOIL GNCC and the AMA Amateur Nationals.

Delivers Confidence in Clutch Feel
AMSOIL Synthetic Dirt Bike Oil’s superior friction-durability properties help minimize clutch slippage, fade and chatter, giving riders consistent clutch feel during takeoffs or when maneuvering around obstacles on the trail. In an extreme simulated-start test, AMSOIL Synthetic Dirt Bike Oil continued to deliver consistent clutch feel following 32 simulated race starts, while a leading original equipment manufacturer (OEM)-branded oil demonstrated inconsistent clutch-lever action and poor clutch feel after 16 starts.

The clutch plates lubricated with AMSOIL Synthetic Dirt Bike Oil remained clean and in good overall condition, while the plates using the OEM oil revealed discoloration and wear. AMSOIL Synthetic Dirt Bike Oil’s superior performance helps instill in riders the confidence that their bikes will perform consistently in all types of riding conditions.

Protects Against Wear
AMSOIL Synthetic Dirt Bike Oil withstands high-rpm operation, extreme heat and mechanical shear. Its synthetic base oils naturally resist viscosity loss and provide a protective film against wear to gears, bearings and pistons. Its anti-wear additives provide an extra measure of protection, promoting long component life to help riders get the most out of their bikes.

• Delivers confidence in clutch feel
• Superior protection against gear, bearing & piston wear
• Maximizes horsepower
• Helps extend clutch life

Extreme simulated start test for clutch plate

RACING IS RESEARCH™
AMSOIL Synthetic Dirt Bike Oil underwent extensive on-track testing in the bikes of AMSOIL-sponsored professional riders on the GEICO/AMSOIL/Honda Factory Connection and Team Babbitt's racing teams. A combination of racer feedback and lab testing allowed AMSOIL to fine-tune AMSOIL Synthetic Dirt Bike Oil for outstanding wear protection and consistent clutch feel — benefits riders demand.

SERVICE LIFE
AMSOIL Synthetic Dirt Bike Oil should be changed according to the vehicle manufacturer's recommendations.

HEALTH & SAFETY
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).

Click here to view the MSDS Data Sheet for AMSOIL DB40.

Keep out of the reach of children. Don't pollute. Return used oil to collection centers.

TYPICAL TECHNICAL PROPERTIES
SAE 10W-40 Dirt Bike Oil (DB40)
Kinematic Viscosity @ 100°C, cSt (ASTM D445) 14.2
Kinematic Viscosity @ 40°C, cSt (ASTM D445) 93.5
Viscosity Index (ASTM D2270) 156
Flash Point °C (°F) (ASTM D92) 246 (475)
Flash Point °C (°F) (ASTM D92) 254 (489)
Pour Point °C (°F) (ASTM D97) -44 (-47)
Noack Volatility, % weight loss (g/100g) (ASTM D5800) 4.0
High Temperature/High Shear Viscosity @ 150°C , 1.0 x 106 s-1), cP (ASTM D5481) 4.1
Four Ball Wear Test (ASTM D4192 @ 40 kgf, 150°C, 1800 rpm, 1 hour),Scar, mm0.39
Foam (ASTM D892, Sequence I, II & III)0/0, 20/0, 0/0
Total Base Number6.62

AMSOIL Dirt Bike Oil for Enhanced & Consistent Clutch Feel

AMSOIL is Devoted to Protection: Dirt Bike Oils

KR4 Testimonial for AMSOIL Dirt Bike Oil

Tips to Effectively Winterize Gasoline Powered Vehicles & Equipment

Also use AMSOIL Gasoline Stabilizer, in addition to fresh Oil & Filter

Did this product meet your expectations?

(click on a star to rate)
Product Name: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)
Current Rating: 5 out of 5 stars
Total Votes: 56 vote(s)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Craig: space

I would buy this again

I race dirt bikes and have found this oil to stay cleaner than others after 10 hard racing hours.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Moto Mike: space

Great stuff

I like the performance of this product in my YZ450F. Clutch feels great, motor runs smooth, and with the preferred customer pricing it's the same or better pricing than anything else.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Robert: space

WIll buy again

Been using Amsiol in my racing motorcycles for more than 25 years and love the performance and wear protection it gives.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jim: space

Kept in stock in my garage

The only oil I use in my bike.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Cliff: space

Each and every thing I own that moves has AMSOIL in or on it

Amazing product

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Willie: space

Good dirtbike oil!

I have this in 3 dirt bikes and so far I have no sticking clutch or anything. So I'm convinced it does it's job!

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bart: space

I love my amsoil! Run it in everything.

My regional dealer I get amsoil through is without a doubt the best freaking guy ever! Always resolves any issue I've had imeaditely

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bob: space

Clutch protection

I started to run this oil on my adventure bikes. Needless to say that it does exactly what Amsoil says it does. Best clutch pull and feel, even after several slipper clutching maneuvers in difficult trails.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Matt: space

Great product.

Put this oil in my CR 85. Clutch feel is better and gear changes are smoother.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rpm: space

Love this stiff

Can't buy better

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dk: space

Pleased

When switching from KTM factory recommended oil I noticed less engine noise and amsoil is not as expensive as the "orange oil". I've not done blackstone tests but I do believe the amsoil is working well for this 350xcf.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by MikeB: space

Only the best for my toys

I currently own 4 dirt bikes and a quad and they all use Amsoil now. I've also rebuilt several bikes/quads that I've sold over the years. I've tested most of the major brands and Amsoil shifts so much better than most of the leading motorcycle specific brands! Amsoil is now my #1 with Max... being #2.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jimmy: space

I will only use Amsoil

I use it in my 2003 Suzuki DRZ 250

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Believer: space

I continue to buy this product

Seems to work great and good clutch feel. Great price compared to dealer oil prices.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by MOTODADJLG: space

THE ORIGINAL AND THE BEST

I have always used Amsoil in my sons Dirt bikes and we have never had the problems others have like bearings going out or rings seizing up.I do all of our mechanic work and motors using Amsoil don't show wear like other oils.Don't compromise protection use Amsoil.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by The pro lube: space

Forever

I use this oil in my dirt bikes and it's awesome it makes my bikes run smooth and the clutch feel is unbeatable it makes it feel super smooth and consistent feel i would definitely recommend it to someone that depends on there engine!!!!!!!!!!!!!!!!!!!!!!!!!!!.......

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Evan: space

The best

Use this in my 2017 Benelli TNT 600. Makes it run like a champ!!

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dave in CO: space

This is the best

I use this oil to keep 3 different enduros running strong.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dewey: space

Works great

Three dirt bikes running strong no clutch slippage great product

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by S409: space

Best Oil for Desert Racing

Amsoil has never let me down. Unlike other oils, Amsoil has never smelt burnt or looked broken down after any of our long desert races.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Casey: space

Excellent Product!

Use in my son's KX250F dirt bike. Noticeable power increase, clutch feel, smoother running and holds up longer than other oils between changes.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by KTM MX: space

Great oil

We use this on our race bike and when we service it still looks clean

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jet A Racing: space

Race oil

When your race counts on superior engine performance there is none better than Amsoil to give you the confidence in your motor.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

10-50 dirt bike oil

Never had a oil related failure

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

Good stuff

This oil runs awesome in my son's kx100.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bill: space

Great oil

I use it in my 2011 KLR650. My bike shifts better since I switched to AMSOIL and performance is much better overall.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dave: space

Improved clutch feel

I switched from the traditional Amsoil Motorcycle oil to the Dirt bike specific formula when it came out a few years back. The claims about improved clutch feel were not exaggerated. Considerably better clutch feel in my old YZ250F. Smoother engagement and a better slip zone.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by BMW Rider: space

Not just for dirt bikes

I use this in my BMW adventure bike which sees hard use of the clutch in off highway riding to work through tough terrain.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by CAJO: space

10/10

Love Amsoil products. Something I can count on always working even when racing is unpredictable.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jeff: space

Amsoil dirt 10w40

Great product! Use on 4 strokes off road bikes that I service! Great protection, quality & consistency!

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jordan: space

Great product

Quality product

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bobcat1: space

Will buy again!

Use this product in two dirt bikes my son and I ride and race. Will use nothing else but Amsoil!

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by E Fryer: space

The only oil I use!

Great product that does everything they say. The only oil I run in my dirt bikes. I don't have to rebuild my engines as often due to the quality of Amsoil. Which saves me money in the long run.

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gary: space

yas

Ive used amsoil since the 70s and I fill its the best product on the market. I mix it 83 to 1 with aviation fuel and its the best,no build of carbon at all!!!!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Big Show: space

Fantastic Oil

I've used this for years in Harley's and saw the difference in dyno numbers first hand as a Master Technician. Now I'm racing dirt bikes again in the GNCC Series and see the difference in engine wear and clutch performance. I would buy this oil even if I were offered other oil for free!

Item Reviewed: Dirt Bike Motor Oils

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Trip: space

Smooth operator

This made the clutch in my Gas Gas TXT 280 Trials bike operate with better control.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by El Cora: space

I would buy this product again and again

Use this oil in dirt/racing bikes. Have been using this oil for the last 5 years in all of our bikes. This product helps the performance of the bikes and would use no other.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chamo: space

I like this product

I use in my dirt bike, excellent!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ray: space

Simply the best!!

I will only run Amsoil in my dirt bike. I change the oil in my 4 stroke 250cc engine every 8 hours. I have over 250 hard woods hours on that engine....and it is still going strong!!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by FMB: space

I will buy this product every time.

I use it in my honda 450x and the clutch feel is real.Amsoil said it helps your clutch and they aren't lying.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by BC: space

I will continue to buy Amsoil for my machines.

Amsoil dirt is exceptional in my Honda. Clutch works great and my motor stays clean!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by johnny: space

amsoil is the most trusted

never disappointed use it in everything

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Charlie TUNA: space

Repeat on buying this oil!!

Grandson races his bike. And this oil seems to help and last longer!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dirtbike dude: space

Great product

Product allows us to run more hours on our KTM's before engine overhaul. Great product!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dan: space

I use Amsoil

I have a lot of engines in different kinds of equipment and vehicles. I use Amsoil in everyone of them except my airplanes. Have been using Amsoil for over 30 years. If I live long enough I will use it 30 more. Great oil and great customer service.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jonny O: space

Great product!!

Best oil around!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Enduro: space

Good results

I switched my transmission oil after I was experiencing some clutch drag from my motorcycle once I switched the clutch drag issues were gone great product

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Srt: space

Top notch

I use this in all of our dirt bikes and atv's. Nothing but smooth running, shifting. The best.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by pro4100: space

Only Oil for me

I dont need to say anything. I am an Amsoil for life customer. Enough said!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gc131: space

Great price and great product

I use this in my 2015 crf450 in both case sides. Works great in the engine and on the clutch side.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Weasel 247: space

Great product!

I used this in my 2007 CRF250R and now it the only oil I used since the first oil change on my 2016 CRF250R and sons 2017 YZ125

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jay: space

I have ran this oil since i started riding/racing

This is by far the best oil i have ever ran in my bike. I have ran synthetic mobil 1 before this and the bike just didnt run as good when i put mobil 1 in there. Amsoil changed that. Thank you Amsoil!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Stanfill25: space

I will buy this again

I use this on my Dirt Bike and use amsoil on every motor I own

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Big G: space

Quality lubricant

I've been riding,racing and maintaining dirt bikes and other motorcycles for over 40 years I have been using Amsoil in all my trucks and motorcycles for around ten years. I have never had a engine failure since moving to Amsoil from Pensoil I have a 2015 Suzuki rmz 250 that I trail ride and my son rides motocross on. I change the oil and filter every 6 hrs per manufacturer recommendations. No problems at all.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rustdoc: space

Improved performance

I use this in the kids dirt bikes and side by side. The performance has been enhanced tremendously.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ebear546: space

Lifetime user

Great product. Oil still looks good after 2-3 times longer change intervals in my KTM.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tool Box: space

Great Product I would recommend it to anyone

I have been using Amsoil for years during my GNCC off road race seasons without an oil related failure. This year I'm running 10w 40w oil designed for dirt bikes. Four races into the season and no problems and clutch wear has been minimal. VEry good product

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Barry: space

10W40

Used in my son's KX 85. Great product with maximum protection while delivering incredible performance.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Lance: space

Definitely will continue to use Amsoil products.

Since changing to Amsoil my 2016 KLR 650 idles, runs quieter and much more smooth. It shifts more precisely and smoother. I noticed the idle RPM increased slightly. I am very pleased with the results.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by ANDREA: space

Great Product!!

We run this product in our dirt bikes and have had nothing but Great results!! As always Amsoil Rocks!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tracy: space

10W-40 Synthetic Dirt bike oil is all i run

I use this in my 2009 WR450F it is a great oil.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)
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