The AMSOIL 100% Synthetic 4T Performance 10W-40 is a special formulated motorcycle oil, which can withstand high temperatures. It performs really well under heavy loads and the heat the engine is developing. This engine oil is formulated for the daily drives in the city and on the highway. AMSOIL 100% Synthetic 4T Performance 10W-40 delivers the performance and protection you would expect from an AMSOIL engine oil.