jafo, I find your information very interesting. You KNOW that these customers were getting 3000 mile oil changes and yet sludge was forming in the engines.
I did notice when I switched from Pennzoil that the interior of my engine looked cleaner. So maybe there was a problem with Pennzoil in the past and maybe not so long ago in the past.
I experienced a very great amount of dislike for Pennzoil from numerous people, including people that I thought knew what they were talking about. A race car driver, people at new car dealerships, etc.
Today it certainly appears from VOAs and UOAs that Pennzoil is very good. But I tend to like Chevron. I have heard nothing but good stuff about Chevron and it is cheaper then Pennzoil.
The title of this post was a question as to why people hate Pennzoil. People certainly do not because Pennzoil is the number one brand in America. And I certainly do not hate Pennzoil. I just tend to like Chevron more.
Castrol is also highly regarded at this site. I know of a very, very good mechanic (a woman) who recommends Castrol to her customers. But somehow I just can't develop warm and fuzzy feelings for Castrol. The GC deal, Castrol claiming that its Syntec was synthetic and charging the same price as Mobil 1, etc., kind of disturb me. The Castrol Syntec Blend may be a better motor oil then the Castrol Syntec (American made).
I tend to just like Chevron better. Hard to beat the price. If Chevron is not available Halvoline is probably the same stuff. I do wish the Chevron 0W-30 was available here for the wintertime. I just like it.