Best motorcycle oil you can buy!

See below how Amsoil's motorcycle oil is compared to Royal Purple, Motul, Golden Spectro, Valvoline, Belray and Castrol GPS. After studying this page, dollar for dollar, you can clearly see that Amsoil's 10W40 motorcycle oil is the best value for your money. And the prices here for Amsoil are retail. Preferred customers get a further discount on this oil.

10W40 High Performance Synthetic Motorcycle Engine Oil

Motorcycle Oil 10W40 Product Codes:
1 Quart: MCFQT
Carton of 12 quarts: MCF01
30-gallon drum : MCF30
55-gallon drum : MCF55

Wholesale and preferred customer large discounts of approximately 25% off! To enroll in this program, click here for details. Preferred customers get DEALER COST!

API Service:
API SG, SL/CF; JASO MA

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.

Best oil for motorcycles

Improved Transmission Protection

AMSOIL Synthetic Motorcycle Oils not only provide superior protection for motorcycle engines, they also provide superior gear protection, meeting API GL-1 gear lube viscosity requirements. AMSOIL Synthetic 10W-40 Motorcycle Oil (MCF) meets SAE 80W-90 gear lube requirements, while AMSOIL Synthetic 20W-50 Motorcycle Oil (MCV) meets SAE 90 gear lube viscosity requirements.

AMSOIL Synthetic Motorcycle Oil outperforms other conventional and synthetic motorcycle oils. Its exceptional high-temperature film strength provides maximum wear protection in the most demanding operating conditions. Engineered to prevent damaging sludge and carbon deposits, AMSOIL Synthetic Motorcycle Oil promotes superior engine cleanliness, while delivering excellent wet-clutch performance and transmission protection. It resists acid formation and provides superior rust protection, which is especially important during storage.

Motorcycle oil 4 ball wear test AMSOIL Synthetic Motorcycle Oil not only provides superior protection for motorcycle engines, it also provides superior gear protection, meeting API GL-1 and SAE 80, SAE 80W-90 and SAE 90 gear lube requirements.

AMSOIL Synthetic Motorcycle Oils exhibit higher HTHS viscosities than competing conventional and synthetic motorcycle oils. As seen in the graphs, AMSOIL Synthetic 20W-50 and 10W-40 Motorcycle Oils displayed the highest High Temperature/High Shear viscosities in their respective test groups, providing motorcycle engines and transmissions operating in the harshest conditions with superior protection against wear and viscosity loss and eliminating the need for separate gear case oils as recommended by some competitors. Synthetic 10W-40 may also be used in two-cycle transmissions.

Motorcycle oil viscosity comparison Excellent Wet Clutch Performance

Many motorcycles utilize a clutch that is immersed in the motor oil. The friction modifiers present in many automotive motor oils and the extreme pressure additives present in EP gear lubricants produce a low coefficient of friction between the clutch discs and plates, resulting in clutch slippage and glazing. Slippage leads to increased operating temperatures and reduced clutch life. AMSOIL Synthetic Motorcycle Oils are formulated without friction modifiers, providing positive clutch engagement, longer equipment life and reduced temperatures. AMSOIL Synthetic Motorcycle Oils meet the clutch compatibility requirements mandated by JASO MA.

Excellent Corrosion Protection

Motorcycle oil comparison with Castrol rust Most motorcycles spend the majority of their lives either parked or in storage, but most motorcycle oils fail to address corrosion problems. Corrosion protection during storage and in humid conditions is essential to extending equipment life. AMSOIL Synthetic Motorcycle Oils are formulated with specialized additive technology that not only protect against corrosion and acids during operation, but also provide exceptional protection during storage. The ASTM D-1748 Rust Test measures a lubricant's ability to protect against rust and corrosion. A standard metal reference coupon is immersed in the test oil before being placed in a humidity cabinet for 24 hours at 120 degrees F. As seen in the photos, the reference coupon treated with AMSOIL 20W-50 Synthetic Motorcycle Oil showed no signs of rust and corrosion, while the competitor failed the test.

Outstanding Heat Resistance

Motorcycles operate in demanding, high heat conditions that require robust high temperature deposit control additives. While many conventional oils break down and oxidize when faced with high temperatures, causing formation of carbon and sludge deposits, AMSOIL Synthetic Motorcycle Oils effectively withstand oil break-down and oxidation, keeping equipment running cooler and minimizing oil consumption, thickening and emissions. Air-cooled engines get especially hot while idling in traffic, commonly reaching temperatures up to 240 degrees Fahrenheit. The extra margin of protection provided by AMSOIL Synthetic Motorcycle Oils is especially important for hot running air cooled motorcycle engines.

Foam Control

High engine speeds and transmission gears in motorcycles churn the oil, suspending air and causing foam. When this oil and air mixture is drawn into a loaded area, the air compresses and decreases the thickness of the oil film, compromising wear protection. In addition, suspended air promotes oil oxidation, reducing its service life. AMSOIL Synthetic Motorcycle Oils greatly reduce foaming to provide long term lubricating protection in high speed, high RPM conditions.
Motorcycle oil wear comparison

Robust Additive Levels

Recent automotive motor oil regulations have limited certain additive levels, including the anti-wear additive known as ZDDP. ZDDP is an extremely effective anti-wear, anti-oxidant additive, and reducing its level results in compromised wear control and shortened service life. Because motorcycle applications require robust additive systems to control wear and oxidation, use of an automotive motor oil or an automotive motor oil re-labeled as a motorcycle oil compromises protection and performance. AMSOIL Synthetic Motorcycle Oils are overtreated with robust additive packages, including high levels of calcium, phosphorus, zinc and additional oxidation inhibitors, to extend oil life expectancy, provide unmatched engine cleanliness and greatly reduce wear.

AMSOIL Synthetic Motorcycle Oils are recommended for twice the manufacturer's recommended drain interval for on-road motorcycles.

The Four Ball Wear Test (ASTM D-4172) determines the wear protection properties of a lubricant. The smaller the average wear scar, the better the wear protection provided by the lubricant. AMSOIL Synthetic Motorcycle Oils produce significantly smaller wear scars than competing motorcycle oils, providing unsurpassed protection against engine wear, reducing maintenance costs and extending equipment life.

Motorcycle oil price comparison

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.

TYPICAL TECHNICAL PROPERTIES
AMSOIL HIGH PERFORMANCE SYNTHETIC 10W-40 MOTORCYCLE OIL
Kinematic Viscosity @ 100°C, cSt (ASTM D-445)	13.9
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)	93.36
Viscosity Index (ASTM D-2270)	152
CCS Viscosity, cP @ (°C) (ASTM D2602)	6794 @ -25°C
Flash Point °C (°F) (ASTM D 92)	234 (453)
Pour Point °C (°F) (ASTM D 97)	-46 (-51)
High Temperature/High Shear Viscosity @ 150°C , 1.0 x 10 6 s -1 (ASTM D 4683), cP	4.52
Noack Volatility, % weight loss (g/100g) (ASTM D-5800)	6.44
Four Ball Wear Test (ASTM D 4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour, Scar in mm)	0.40
Total Base Number	11