AMSOIL Synthetic 10W-40 and 20W-50 Motorcycle Oils

AMSOIL synthetic 10W-40 and 20W-50 motorcycle oils give motorcyclists what they need: superior wear protection for high-stress motocycle engines and transmissions, as well as clutches that stay clean and deposit-free.

• Runs cooler - reduces crankcase temperature.
• Superior 12+ TBN synthetic formulation provides long service life and mximum protection against engine wear.
• Wet clutch compatible.
• Recommended for all V-twin and other motorcycle engines requiring an API CD, JASO MA, SG-CG or SH-CD oil.

Wear Protection

How do other motorcycle oils compare to AMSOIL Synthetic Motorcycle Oils in wear protection?

AMSOIL submitted five popular motorcycle oils to spectrographic analysis and Four-Ball Wear (ASTM D4172) testing and compared the results to those of AMSOIL Synthetic 20W-50 and Synthetic 10W-40 Motorcycle Oils. None of the popular motorcycle oils compared favorably to the AMSOIL products in wear additive content or wear protection (see Spectrographic Analysis chart and Wear Protection graph). As seen in the chart, AMSOIL Synthetic Motorcycle Oils contain significantly higher levels of zinc and phosphorus than the competing oils, and while simply adding more zinc and phosphorus doesn’t insure good performance, AMSOIL has formulated motorcycle oils with the best additives in the optimal quantities to provide superior wear protection.

What about oil temperature and wear? A Four-Ball Wear Test was con-ducted at 302°F/150°C, a higher temperature that would typically be associated with motorcycle oil operating temperatures in extreme high performance situations. AMSOIL products protect better in higher temperatures than any of the tested motorcycle oils do, leaving a wear scar up to 37 percent smaller. Some motorcycle transmissions and engines share a common oil sump; so the engine oil must also provide wear protection to the transmission gears, which, according to Motorcycle Consumer News (Aug. 1998) are subject to high gear surface pressures and gear rotation speeds. The superior performance of the AMSOIL Motorcycle Oils in the Four-Ball Wear Test applies here, too. Motorcyclists will find no better oils than AMSOIL Synthetic Motorcycle Oils.

AMSOIL Formula 4-Stroke Synthetic Motor Oil

AMSOIL Formula 4-Stroke Synthetic Motor Oil is specially formulated to provide serious protection in recreational four-stroke engines. AMSOIL 4-Stroke virtually eliminates wear and keeps heat and emissions to an abolute minimum.

Formulated with a broad 0W-40 viscosity range, AMSOIL Formula 4-Stroke delivers unsurpassed protection and performance year round, in both hot and cold temperature extremes. As an SAE 40 weight motor oil, it protects hot operating, hard working four-stroke motors, while its SAE 0W rating provides excellent cold weather starting and quick post-startup lubrication in the coldest temperatures.

AMSOIL Formula 4-Stroke Synthetic Motor Oil contains a robust dispersant/detergent package ideal for high-stress four-stroke engines. Formula 4-Stroke is formulated for extended drains, maintaining its 0W-40 viscosity grade throughout its service life and providing long-term protection against equipment wear.

AMSOIL Formula 4-Stroke Synthetic Motor Oil is formulated without friction modifiers, ensuring dependable starting, smooth running, improved fuel efficiency, desirable stall speeds and clutch compatibility.

The high temperature operation of four-stroke engines often causes conventional four-stroke motor oils to volatize and thicken, contributing to poor oil circulation, reduction in fuel efficiency, excessive emissions and increased wear. The superior volatization and thickening resistance of AMSOIL Formula 4-Stroke Synthetic Motor Oil, however, keeps engine wear, oil consumption and emissions to a minimum while keeping oil circulation efficient and fuel economy high.

High temperature operations also lead to the thermal degradation and oxidation of conventional oils, forming deposits, sludge and varnish. The superior oxidative and thermal stability of AMSOIL Formula 4-Stroke Synthetic Motor Oil inhibits the formation of varnish, deposits and sludge so equipment runs clean in the high-stress, high temperature conditions common to four-stroke engines.

AMSOIL Formula 4-Stroke Synthetic Motor Oil provides second-to-none protection and performance in Yamaha®, Suzuki®, Honda®, Mercury®, Kawasaki®, Arctic Cat®, Polaris®, Nissan® and Bombardier® motors and transmissions specifying 0W-40, 5W-30, 10W-30 and 10W-40 viscosity grades. AMSOIL Formula 4-Stroke Synthetic Motor Oil is also safe for use in wet or dry sumps and is recommended for manual or automatic clutches and with clutch plates.