AMSOIL 10W-40 Synthetic Motorcycle Oil

AMSOIL MCF Motorcycle Oil SAE 10W-40 Synthetic Motorcycle Oil   (MCF) AMSOIL Synthetic Motorcycle Oils have been reformulated with new high performance additive technology that provides even greater multi-functional benefits for the special requirements of motorcycle applications. These independent and exclusive new AMSOIL formulations provide second-to-none viscosity protection for hot-running American and foreign motorcycle engines, transmissions and primary chaincases. Performance specifications include:  API SG, SL/CF; JASO MA See Pricing Information or Place an Order Package sizes include:
1-Quart Bottle 1-Quart Bottles (case of 12) 30-Gallon Drum 55-Gallon Drum

AMSOIL Recommended Oils For Harley Davidson Motorcycles

AMSOIL 10W-40 Synthetic Motorcycle Oil  (MCF) is recommended for Honda, Kawasaki, Yamaha, Suzuki, BMW, Husqvarna and KTM motorcycles calling for a 10W-40 or 20W-40 viscosity, providing superior protection in engines and transmissions.

AMSOIL MCF 10W-40 is also recommended for use in the primary chain case on Harley-Davidson motorcycles.

AMSOIL MCF is multi-functional and fulfills the requirements of both domestic and foreign motorcycles. It outperforms other conventional and synthetic motorcycle oils.

AMSOIL, the leader in synthetic lubrication, produced the world’s first API qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL The First in Synthetics®to do the best job protecting your motorcycle.

Reduces Friction, Heat and Wear In high heat conditions, engine protection is not sacrificed with AMSOIL Synthetic Motorcycle Oil. It has the best high temperature film strength (see High Temperature Viscosity Protection graph below) of all oils tested and contains a heavy treatment of anti-wear additives to reduce wear regardless of the operating conditions (see Wear Comparison graph on reverse). AMSOIL MCF is thermally (heat) stable and contains maximum levels of oxidation inhibitor additives. It is extremely resistant to breakdown and engineered to prevent damaging sludge and carbon deposits for superior engine cleanliness.

10 W-40 Motorcycle Oil High Temperature Viscosity Protection Higher values reflect better film strength ASTM Test Method D-4683 March 16, 2005
10W-40 Motorcycle Oil Wear Comparison ASTM Test Method D-4172 March 16, 2005
AMSOIL 10w40 High Temp Viscosity 10w40 Motorcycle Oil Wear Comparison

Provides Extreme Pressure Quality Protection for Gears and Chains With AMSOIL MCF, there is no need for separate transmission or primary chaincase lubricants. It is absolutely shear stable and will not thin out from mechanical activity. AMSOIL MCF performs like a gear lube without the negative effects of extreme pressure additives. In the FZG gear test, AMSOIL MCF achieved a perfect score with a “zero” wear rating (see photo below).


FZG Gear Test (ASTM D-5182) AMSOIL 10W-40 (MCF)

FZG Gear Test (ASTM D-5182) Motul 300V 10W-40

AMSOIL Gear Test
Oil Gear Test

Delivers Superior Rust Protection Motorcycles are prone to rust from storage, humidity and short drives. Rust can cause major damage such as roller bearing failure, uncontrolled wear, compression loss and blow-by. Good rust protection, however, comes by design and is not natural to engine oils. Unlike many motorcycle oils, AMSOIL MCF contains special anti-rust agents. It passes the ASTM D-1748 humidity cabinet rust test and clearly demonstrates superior rust protection (see photos below).

Rust Test ASTM D-1748 AMSOIL 10W-40 (MCF)

Rust Test ASTM D-1748 Castrol GPS 10W-40

AMSOIL Rust Test
Catrol 10w40 Rust Test

Provides Excellent Wet Clutch Performance AMSOIL MCF contains no friction modifiers and promotes smooth shifting and positive clutch engagement. AMSOIL MCF controls heat and prevents slippage and glazing, and its high TBN resists acids that can degrade clutch material, helping improve clutch life.

APPLICATIONS AMSOIL Synthetic 10W-40 Motorcycle Oil is recommended for liquid or air-cooled 4-stroke engines. It meets SAE 80W/90, API GL-1 gear oil requirements and is recommended for transmissions on both 4- and 2-stroke motorcycles. AMSOIL MCF is recommended for Honda®, Kawasaki®, Yamaha®, Suzuki®, BMW®, Husqvarna®, Victory® and other motorcycles where 10W-40 or 20W-40 engine oils or SAE 80W/90, GL-1 gear oils are used. Recommended for Harley-Davidson ®  primary chaincase wet clutch applications. Not recommended for shaft drive hypoid gears or where an API GL-4 or GL-5 gear oil is required.

MIXING AMSOIL AMSOIL Synthetic 10W-40 Motorcycle Oil is compatible with conventional and synthetic motor oils; however, mixing oils may shorten the oil life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

SERVICE LIFE Recommended for use up to twice the motorcycle manufacturer change interval (miles/hours) or one year, whichever comes first, in engines, transmissions and primary chaincases. For Big Twin Harley-Davidson transmissions only, follow the Harley-Davidson recommended drain interval for synthetic oil of up to 20,000 miles or one year, whichever comes first. When using an engine filter other than AMSOIL Ea, change the filter at standard intervals.

For “off-road” use, change AMSOIL MCF at motorcycle manufacturer intervals. Racing or modified engines are excluded from extended drain interval recommendations. Oil changes are at the owner’s discretion.

Cost Effective AMSOIL Synthetic Motorcycle Oils provide excellent cost effectiveness and are cost competitive with competing high end motorcycle oils. The unmatched protection and performance provided by AMSOIL Synthetic Motorcycle Oils is excellent insurance for today’s expensive motorcycles and custom bikes.


SAE 10W-40 Synthetic Motorcycle Oil   (MCF)

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)


Kinematic Viscosity @ 40°C, cSt (ASTM D-445)


Viscosity Index (ASTM D-2270)


CCS Viscosity (ASTM D2602)

6794 @ -25°C

Pour Point °C (°F) (ASTM D-97)

-46 (-51)
Flash Point °C (°F) (ASTM D-92) 234 (453)
High Temperature/High Shear Viscosity @ 150°C , 1.0 x 10 6  s -1  (ASTM D 4683), cP 4.52
Four Ball Wear Test (ASTM D-4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour), Scar in mm 0.40

Noack Volatility, % weight loss (g/100g) (ASTM D-5800)


Total Base Number

Foam (ASTM D-892, Sequence I, II & III 0/0/0
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