Yes, the zinc additives (ZDDP) have been removed or greatly lowered in on-road automotive oils - gas and diesel sold in the USA and Canada. They were left in for oils used in Europe.
They are supposed to be necessary for all engines with flat tappets/lifters - i.e. any engine that does NOT have a roller-cam. That includes most if not all small engines. Also most cars and trucks before the mid-80s, just about all farm tractors, etc.
If you want proper protection, just buy an off-road oil. Any good tractor dealership should have it.
Until last year, you could just buy a good diesel oil like Rotella T and be safe. No more. Rotella T also lowered the addtives to meet the newest diesel emmissions standards (unless you buy Rotella in Europe).
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
... [Read Article]
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