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FYI updated recent observations from actual testing:
Havoline - can attract moisture because of a ester component that is not always hygroscopically stable.
Motorcraft - if COP product under heavy valve train or cam pad wear testing will show more wear than others.
Pennzoil - good overall but wear control under severe stress can be less than stellar.
Chevron- Don't see much of the basic product anymore but what I do see looks a lot like Havoline.
Schaeffer- amazing product, better than their own bench testing shows and hats off to that company for producing excellent product!
Castrol - GTX formula changes so much recently I can't tell which supplier is making it!
QS is a sleeper is excellent wear control and in house competition between QS and Pennzoil keeps this a good bet for low wear but watch out if draining longer.
Shell- another sleeper that depends on which part of the country you are in. Overall impressive product and the brand is being foisted on the scene to capture lower end market from others. As good as Chevron was 2 years ago. If in Canada you are getting a great value from a certain base oil maker there branded under this name.....
