Gosh, I hope you are not referring to Shell Rotella Synthetic as a cure for the Zinc/Phosphate depletion in newly formulated oils or for that matter using any synthetic oil in a flat tapped, high impact engine.
Synthetic oils by their chemical backbone do not have the ability to form complete bonds with these two additives. The P-Chem regarding synthetic oils is they have the ability to be fluid and have a high lubricative coefficient at high or extreme low temperatures. However with that said, please never confuse synthetic oils for something they are not. Namely a carrier for protection against high impact abrasion and scuffing which is what Zinc and Phosphate additive do, but they need to be able to bond a carrier molecule in order to do that.
Chemistry was my world for years, so I thought I'd add a little something to this discussion. Oh, diesel oils won't cut it either they have a too high amount of ash content in their formulation and that's bad for the high impact engines as well unless you want to change your oil every 1000 miles or so.
Thanks in Advance!
David
Born Buick - " I like things just the way they were and drive-em just the way they are "
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