Hi all,

I seem to recall reading about this topic in the recent past, but couldn't find anything using the search feature. My engine re-builder installed a new cam in my 225, slant 6. He is recommending I add a bottle of camshaft break-in lube (such as Comp or Lucas), with a zinc additive, every time I change oil from here on out. His reasoning is that modern oils aren't formulated with zinc to guard against wear, and that most modern engines use roller camshafts, with less valve spring pressure, and don't require it. Just wondering what the prevailing opinion is. As always, thanks very much for all replies.

Roger

oil additive, either zddpplus or the hughes moly additive, is the only snake oil i use.

ao far, so good

Yes you need an additive, although with the spring pressures associated with a slant 6 I don;t think you have to be too concerned about which one.
Comp Cams additive (from what I have heard) is actually a megadose of Moly, not zinc. I don't know about Lucas. There are some oils that cater to our concerns (Royal Purple, Amsoil, Redline etc) by purporting to have plenty in the bottle already. Diesel oils are still ok (Chevron Delo, Shell Rotella) but they do have much less than they used to, and are likely to continue to decrease in the future.
ZDDPlus (I use it) is a Megadose of Zinc and is available from Ebay, Eastwood, or direct www.zddplus.com
Even STP red has about 4000ppm (you want at least 1200ppm in the pan, the "energy conserving" regular oils on the shelf can only be trusted to have 600-800 ppm.

Do a search on Zinc, you will find lots of info

I use a can of EOS (engine oil suppliment) from GM on every oil change.