Re: High Zinc (ZDDP) Engine Oil: My 2 cents
Years ago a product called Street Legal Oil Boost (SLOB) was on the market and I bought around 20 bottles. It's 4800 ppm of zinc.
I use it in my older engines.
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1975 Cub Cadet 1450 with mower deck, tiller and snowblower
A Gravely 10A, Super Convertible and 5645