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Yes, HDEO are much better. Although low ZDDP was primarily in SL and SM oils (many old cars died on those). Levels were raised in SN along with new EP/ET additives. This also varied by oil-weight as well. Certain Mobil-1 weights didn't drop ZDDP levels much even in the SL/SM era. Probably because it was factory-recommended oil by Porsche.
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