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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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