Quote:
Originally Posted by 67ChevyRedneck
Yes, it used to be in all oils but has been phased out over the years. Some brands still have it, I think Valvoline might make an oil "for older cars" that still has it, I think Rotella still has it, but it's better to be safe than sorry. I've been running this stuff in my 350 and ford 289 for years. You only need one per oil change.
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From what I understand of the loss of zinc in our oils, is that it effects the older flat tappet motors, as in our old Allis Chalmers tractors. It is eating up the cam shafts. Where you have a rotating lifter you have no problem.