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Yeah, all this talk makes me want to add some EOS to my engine. I recently decided to use some OLD (unopened NOS) oil I got from the junkyard, to thin it down for the colder temps as the 15-40 Delo (CI-4 i have been stock piling) is too thick for these colder temps in NE. Every once and awhile I found some old oils at the yards and i have been stock pileing it as I get it. So when the colder temps came I switched the oil and added some Quaker state 10-30 from 1988-1989 time frame and added a some EOS for good measure. I figured since I hardly run it this time of year that it can only help, especially upon initial startup .
Settle down. Our stock to mildly built flat tappet cam engines don't need more than about 1200 ppm zinc. I run heavy duty, 5-40 Shell Rotella T synthetic oil, which as about 1400 ppm zinc. That's more than enough for my mild engine. Now, if you are running high lift, high pressure springs, then more zinc is needed.
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