My son-in-law, who used to race motorcycles, used a major manufacturer brand of synthetic oil. I suggested he try Amsoil and sent him a case of the AMSOIL 20-50 V-Twin. He called me back after a few races and road trips using the Amsoil in several of his motorcycles. He told me the first thing he noticed when he changed over to AMSOIL was that his motorcycle immediately shifted smoother using Amsoil. He also told me that he used an infrared thermometer to check temperatures at various locations on the motorcycle engine. When the engine was up to operating temperature, the AMSOIL allowed his bikes to run smoother and 20 to 50 degrees cooler due to less friction of the moving parts, read more.