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Posted by gmharris [71.105.178.157] on Tuesday, February 15, 2011 at 23:33:04 :
In Reply to: Anyone here adding zinc to their oil? posted by Tim Holloway [69.54.28.229] on Tuesday, February 15, 2011 at 20:12:23 :
Probably, low stress engines like ours can get by with the lower zinc levels in today's oils.
When the tip of the cam lobe rides over the tappet, the oil can be squeezed out, especially in high performance engines with high spring loads. The zinc stays to lubricate the tip.
Special break in oils should be used for new cams. These oils contain higher zinc levels. High zinc level oils and additives can be obtained at speed shops. Oils designed for diesel engines usually have higher zinc levels.