Originally Posted by Chicago190
That article is over 10 years old. Good info, but the zinc content is unreliable because it was only the last few years that the EPA mandated lower levels of zddp in oil because zinc build up on catalytic converters was causing poor performance.
That's the key. For more than you ever wanted to read about the subject, you can hunt down an oil thread from about 2007 on www.correctcraftfan.com
. The horse was pretty well beat to death.
There was a later thread over here, too. From that, it was somewhat settled that the MC engines that would need to be worried about these things are any Fords and the pre-vortec TBI Chevies.
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