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tubman · 10-15-2020, 11:49 AM

It is my understanding that any motor oil that has a "50" in it's viscosity (e.g. 20W50 mentioned above) has adequate zinc in it. When I was racing my dirt car with the hemi, I used Mobil 1 15W50 that had 1200-1300 ppm zinc, just like the bad old days.

I will admit I haven't checked lately.

10-15-2020, 11:49 AM	#24
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,312	Re: Marvel Classic Motor Oil It is my understanding that any motor oil that has a "50" in it's viscosity (e.g. 20W50 mentioned above) has adequate zinc in it. When I was racing my dirt car with the hemi, I used Mobil 1 15W50 that had 1200-1300 ppm zinc, just like the bad old days. I will admit I haven't checked lately.