Quote:
Originally Posted by 40 Deluxe
Looking at the longevity of engines from the last 15 or 20 years(often 300-400,000 miles) I'd say what the petroleum engineers have done is to the benefit of our old engines! The only time extra zinc is needed is if we're running high RPM high pressure valve springs. Remember, there was no zinc in oil in the flathead's day!
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We have also changed metals , gone to roller valve train ,variable valve timing, timing belts etc. The engines built today are every bit as different as the oils