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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that�s wha
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