Re: Breaking in an engine. What oil to use?

Posted by lee on September 16, 2004 at 11:37:57 from (24.24.95.246):

In Reply to: Breaking in an engine. What oil to use? posted by JBlavl on September 16, 2004 at 10:49:19:

The lore about synthetic on break-in is not a load of crap at least in the automotive world. No
good engine builder would use it to break in a motor. Use a straight 30 weight oil and change it out for synthetic if you want. There is an issue with automotive high performance engines now days in that most oils have had the zinc content reduced or eliminated causing break-in issues with cams, especially solid lifter cams. These automkotive cams have high lift and valve trains use much heavier valve springs than in these old tractors. Lots of guys break-in with a GM product called GM EOS an additive and a straight weight oil. They also use a special cam lube on assembly.

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