Motor Oil Info

AMSOIL Synthetic Diesel Oils are the premium choice for diesel applications, resisting shearing forces and fuel dilution to maintain their protective film strengths and stay in grade. Shear stability measures a lubricant’s ability to withstand shearing forces without degrading to a lower viscosity. To meet CJ-4 requirements for shear stability, the American Petroleum Institute (API) requires diesel oils to pass the Kurt Orbahn 90-cycle Shear Stability Test. So AMSOIL up the test to 180 cycles, to see what would happen.

Of five oils tested, AMSOIL was the only one to maintained viscosity and was the only oil to stay within the SAE 40 viscosity rating. As other oils lost viscosity due to shearing forces and fuel dilution, their ability to protect against wear was jeopardized.