Easy, Drags, it was a chuckle, didn't mean to cause offense. It's the beaten-down horse all over again. Folks who have forgotten far more than most will ever know about the tribology have stated many times, the color of the oil bears NO relation to performance, color or TBN number, an important factor in determining whether the oil is "worn out". The only true "facts" are those produced by UOA and a decent analysis by the likes of our Mr. Dyson here or another of similar scientific/professional quals. All else is speculation and/or slander of the brand.
As for Pennzoil causing sludge, in the era 1965-present, I've never heard such things until I started reading here a few years back. Pop was a Golf-Arnie/Pennzoil nut and I used to change the family cars' oil from the age of 13 or so, and every 3K, did the filter, Pennzoil (probably 10W40 winter, 20W50 summer). Pop's cars were clean as a whistle under the valve covers and as was the case throughout that era, the bodies rusted and the cars were replaced far ahead of any issues with the engines. Between that experience, and the testimony of many that are actually in the bizz, I find the Pennzoil-Sludge stories to be just that. If there was a sludge situation, I'd want to see OCI records, the application-engine in question, driving habits, etc., etc.. There are other factors besides Pennzoil in a deal like that. BTW, I'm NOT a Pennzoil-employed shill, although I do stash the product and have used it in the past and will again in the very near future.
The blanket statement, "Pennzoil always caused sludge" doesn't fit reality. Nor does it fit any other brand at this stage of the game, assuming correct oil/correct application. Meanwhile, didn't mean to offend.. S.A.T.
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