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 - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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