AMSOIL Resists Viscosity Breakdown Better Than Syn3*

The industry standard CEC L45-KRL, ASTM D445 test for shear stability shows AMSOIL Synthetic V-Twin Motorcycle Oil significantly outperforms Harley-Davidson Screamin’ Eagle Syn3* in resisting viscosity breakdown.

Chart comparing Viscosity Breakdown of AMSOIL Synthetic V-Twin Motorcycle Oil and Harley-Davidson Screamin' Eagle SYN3 oils.

The following is taken from the Savant Labs, an independent testing lab. (SLS Note: I don’t know who did the testing for AMSOIL. This is just for information on the test that was done.)

Shear Stability and Viscosity Loss

Shear stability is an important aspect of lubrication. Most multigrade lubricants are formulated with viscosity modifiers in order to increase the viscosity index (VI) to ensure the lubricant can provide a sufficient film thickness to protect the equipment or engine from wear. Viscosity modifiers (VM) tend to be polymer based chemistry that are susceptible to shear thinning. When a lubricant undergoes shear thinning, the viscosity of the fluid can be lowered by an entire ISO grade leaving moving parts in danger of wear or seizure. To ensure the stability of the fluid’s viscosity, tests are performed to analyze behavior under shear stress and temperature. 

KRL (Tapered Roller Bearing)

The KRL shear test uses a tapered rolling bearing in a cup fitted to a four ball instrument. Load is applied to the bearings as they are rotated at a certain RPM for a specified length of time. The test is typically run for 20 hours. KRL is considered to be one of the most severe shear tests and is used for driveline fluids and gear lubricants.

So, how well does your oil stand up to the extremes you and your bike place on them. If you are running AMSOIL, you don’t have to worry. AMSOIL V-Twin Torture Test

No matter what lubricant you need for your cars, truck, toys and equipment be it gasoline, diesel, 2-stroke or 4-stroke, there is a good chance that AMSOIL has a quality synthetic lubricant to keep it running smoother, cleaner and longer.

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