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Do you have an UOA on the M1 5W50, which supports your claim? M1 5W50 looks to be a much more robust oil than the Motorcraft 5W50 according to its PDS and VOA.
Do you have an UOA on the M1 5W50, which supports your claim? M1 5W50 looks to be a much more robust oil than the Motorcraft 5W50 according to its PDS and VOA.
Seen a few UOAs from 15W-50, they sheared about like the others we have both seen.
All 5W50 oil will shear to some extent, but how much over miles depends on the quality of the viscosity modifiers and the engine's propensity to shear oil. I'd still like to see a couple of UOA reports of the M1 5W50 to see how it performs in the 5.4L motor before making any conclusions.