SAE 10W-40 Synthetic Motorcycle Oil: MCF The Four Ball Wear Test (ASTM D-4172) (see chart below) determines the wear protection properties of a lubricant. The smaller the average wear scar, the better the wear protection provided by the lubricant. AMSOIL 10W40 MCF 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.	SAE 10W-40 Synthetic Motorcycle Oil: MCF The high temperatures and tight tolerances common to motorcycle applications also affect viscosity. The High Temperature/High Shear (HTHS) Test (ASTM D-4683) (see chart below) measures a lubricant's viscosity under severe high temperature and shear conditions. The more resistant an oil is to high temperature viscosity loss, the better it protects, and even a HTHS difference of 0.1 cP makes a significant difference.
AMSOIL 10W-30 Excels in API Sequence IIIF Test API Comparative Motor Oil Testing AMSOIL Motor Oil and Filtration Guide AMSOIL Synthetic Gear Lube Outperforms Valvoline Gear Lube	AMSOIL 409,000-Mile Oil Drain Engine Tear Down AMSOIL Change Interval Charts AMSOIL Performance Tests AMSOIL Proves Superior in Clark County Field Test
Volatility really is seen as "the amount of oil that evaporates from your engine". Technically, volatility is defined as the characteristic of liquids to become a vapor when heat is applied. So, if an oil has low volatility, then it withstands heat better than an oil with high volatility.	As you can see from the test results shown in these two independent lab tests, AMSOIL definitely has the competition whipped in this category. You will see much less oil consumption and better fuel mileage when using AMSOIL Synthetic Oils. That means oil left in your engine, and money left in your pocket.