Posted by Indiana Ken on January 18, 2019 at 06:59:25 from (66.249.234.253):
In Reply to: Zinc talk posted by David G on January 17, 2019 at 19:21:13:
Yes, I agree with your summary. I have read a bit on the subject and talked to people in the engine building business. The Zinc is most needed in flat tappet (non-roller) engines with aggressive cam profiles. These engines must also use stiff valve springs to keep the valve train in contact with the cam at higher RPMs. Old tractor engines do not use aggressive cam profiles or heavy valve springs. Many new cars use roller followers making the lower zinc levels a non-problem.
One additional point: I have seen the zinc additive sold in small bottles to add to your oil...just add this to get the zinc level back to the good old days. It my understanding the zinc needs to be blended at the correct temperature and sequence with the other additives. It can not be just poured in and be effective.
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