[tirebird]

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Being as Amsoil did the testing and it's posted by Amsoil, a person *might* want to take that article with a grain of salt...for us old car guys, it's mainly gonna come down to zinc & moly content, moreso than who's oil pours the best at the lowest temperature...

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I'm not so sure that Amsoil did the testing but they sure paid for the testing. What I find interesting about the results is that their biggest competitor, the one they're always comparing their product too, Mobil 1, came out so well. I'm told by my engineering friends that the truly independent SAE tests basically mirror Amsoil's results.

Either way, I, like you, because I own a car with a flat tappet cam, want all the ZDDP I can get. That's why I use Mobil 1's 15w-50, which has the old formula of zinc and phophorus.