37 yrs of using it. Many think AMSOIL was born yesterday but they were the very first to come out with a synthetic oil for automotive use, way back in 1972. Mobil 1 did not come out till a few years (circa 1975) later and the others only jumped on the band wagon within the last 5-15 yrs because they see a chance to get a piece of the action while before that they did everything to debunk synthetic oils. I started to use AMSOIL around circa 1976 and soon realized it was a better oil. Since then thats all I use in everything I own.
Everyone hates big oil but IMO for the wrong reasons. The make millions selling the consumers cheap oil and promoting 3,000 mile oil changes.
