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[Rick F]

I posted this in another thread yesterday. There is a independent test done with Amsoil and Mobil 1. If you google "synthetic oil life study" it will be first on the list. Pretty detailed with all the metals and TBN, interval changes etc. They tested it on a Z28. Read the disclaimer, it is pretty funny. I think these guys are non bias on their test. Either way, you can't go wrong with either one.