Quote:
Originally Posted by WSex
with a bigger pump penzoil 25-50 racing for the year the car is the motor needs zinc he said synthetic is the worst thing you can do to it. so 25-50 penzoil w zinc or rotella 15-40 with zinc.
he swore on the penzoil he said if i find any other brand oil in his shop he'd chug it
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All joking aside, Is he 90 years old?
This is all bad advice. It sounds like he builds/built a lot of flat tappet gen I stuff.
20w50 is too heavy. it is recommended when you need to take up slop in the build. It also requires more hp to push, and does not flow as quickly. You get a higher pressure at the gauge. Whoopeee, that doesn't mean you are protecting your engine better.
There is nothing wrong with synthetics. Some of our cars left the factory with it. Zero, zilch, nada. Some vettes in the 70s even left the factory with synthetics, with flat tappet cams and gen I engines.
And he can get to chugging. The only off the shelf oil at this time, 9/27/12, that has the "proper" ZDDP levels people look for is valvoline VR1. No Castrol, Mobil, Shell, Pennzoil, Wolf's Head, Quaker State, etc off the shelf oil has it anymore. So if you want zinc, it ain't in Pennzoil. Rotella used to, but not anymore. It was confirmed right from Shell.