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I have talked with Amsoil technical personnel about this and they claim that every oil additive that has come on the market they have tested. There has never been a after market additive that helped the oil, with many reducing the oils performance, and some that actually react negatively with the oils additive packing rendering the oil useless.

When I lived in Virgina Beach, VA someone I worked with was into restoring Corvettes. He wanted to change his 1974 Vet over to synthetic oil, but he had also just used Slick 50 in the engine. Amsoil technical informed me that changing over to synthetic would be fine, but that the money spent on the Slick 50 would be wasted, since the syn oil is so highly detergent that within several thousand miles all of the Slick 50 would be cleaned from the engine.

Tom