to answer 420s question...its unknown how long amsoil will last...
i believe that there was a thread here that talked about a test done with amsoil and mobil clean 3k..
the amsoil was put in a brand new camaro and has never had an oil change since 2002 and has 40k+ on it, and they tested the oil every 1k to make sure it was "lubricating"...
personally i run the 25k oil and filter from amsoil and my car love it...actually my fionces pt cruiser (pussy and tits)
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