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Old 05-14-2004, 02:36 PM
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New oil formulations, camshaft wear.

This was brought up by Cstraub recently but I found this information and thought I would pass it on to the people here.


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Old 05-14-2004, 05:01 PM
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Good questions Tom.

I read all the previous thread that Cstraub posted and added some info to it myself. I've been looking for all the info that is available on the subject, its slowly beginning to surface as the facts and testing becomes available.
I'll have to diss-agree with the second post from your link.

Additives that would have protected/lubricated the flat tappet camshaft were eliminated to save the catalitic converter and our environment. We no longer need them because our cam and lifters are rollerized.

The additives that are usually refered to are zinc and phosphorous. They have not been totally removed as of yet, but its content in the oil has been reduced some, and from what I hear, another reduction is on the way.

Most data available shows that the zinc content is still around .13% to .15% with some of the new oils having been reduced to .05% zinc. Just don't know which ones yet! LOL

If one looks at the oil content charts that are on the net, the zinc and phosphorous content is still there. I cannot see how these will ever be totally removed from oil just because the roller cams don't need them anymore. The main and rod bearings in ALL engines still need protection from "metal to metal contact" which, at this time, is provided by the zinc and phosphorous content in the oil. Of course there may come a time when something better/different will come along.

"Extreme pressure" additives are not normally found in automobile oil. Those additives are chlorine and sulfur and show up mainly in gear oils and greases.

The use of GM's EOS is a plus for breakin, but "supposedly", once breakin is over, the low zinc oils still work fine.
As always recommended, use the cam manufacturers lube on the cam and lifters to assure good breakin.

Here are some interesting zinc and phosphorous contents of some popular oils.

Last edited by Jmark; 05-14-2004 at 05:27 PM.
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