Re: Zinc Additive in Quaker State
Picking and choosing what to remember what 540 Rat wrote does a disservice to everyone. Here's what he wrote just last month (if we are going to call him the end-all-be-all oil expert):
The old belief that any high zinc oil will provide sufficient wear protection for any engine has never been true, but gullible people have been brainwashed to believe it anyway. And repeating completely false information a million times, does NOT magically make it become true. The fact is, flat tappet lobes are still being wiped while using high zinc oils, because people are following bad advice from critics and even Cam Companies, who simply don't know what they are talking about when it comes to motor oil.
The whole idea of simply needing a high zinc level for sufficient wear protection, is only an old wives tale myth that has been busted. Modern extreme pressure anti-wear additives are equal to or better than zinc. Relying only on zinc as the primary anti-wear component, is outdated technology.Wiped flat tappet lobes continue to happen over and over again, when people use high zinc oils that produce poor results in my testing. Itís time to take notice of that.
540 RAT has also done a study that showed that an oil's ability to hold a high film strength and resist shear was far more important than ZDDP levels.
I sincerely doubt a racer running a .650 lift cam is going to be asking anybody what oil to run, but it seems our average 5000-7000 mile a year Camaro driver can't seem to let this issue go.