Based on what I saw written by a noted YBlock engine builder, any oil with a "30" or more in it has enough zinc. He uses Valvoline 10-30 conventional in most of the engines he builds. No supplement other than for break in..
Quote:
Originally Posted by tubman
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.
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