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One of the difference between Amsoil and Mobil is that Amsoil designs their oils to last 2 to 5 times longer than all other oils. Which is why the warranty on Amsoil motorcycle oils is twice the manufacturers recommended drain interval or 1 year. So with Amsoil you can run the oil in our bikes for 12,000 miles or one year. Mobil will warranty their oil at the manufacturers recommended drain interval (6,000 miles or 6 months).

Tom



No synthetic oils need to be changed because of breakdown. They just get too dirty and carry too many contanimants. Personally I would never go 12k without an oil change no matter what an oil manufacturer says.