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Since we're on the topic of "does changing a hile mile vehicle to synthetic hurt it?", does it hurt anything? I've heard guys swear up and down that it'll cause a high miler to spring leaks like old faithful at Yellow Stone Nationial Park. I think it's BS, but is there something to it? or just myth?




Myth.

Anyone remember Arco Graphite oil? We had a '71 Pontiac Grand Safari wagon with a 455 when I was a kid and my dad switched to Arco Graphite and that stuff seeped out of every place it could find including the head gaskets from what I remember.