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Ok, here is my "outdated" 2 cents worth.
In a class in college, LONG (*sigh*) time ago, we conducted "experiments" on some major brands of oil. We used a "friction" machine, and something that analyed "sludge" from burning an oil. As I recall, the friction tests did bear out some name brands; Castrol and Valvoline were right up there as far as friction performance. Pennzoil, Quaker State, Union's "Triton" and Havoline amongst the worst. This also beared out with the "sludge" test. The "Pennsylvania" oils burned with the most sludge, (Pennz and Quaker), while Castrol and Valvoline were cleaner comparitively. I do not recall all the other brands we tested off hand, but those few stand out in my mind. I think we tested "Standard Oils" stuff also and they did OK.
On a "practical" note, in auto shop, the worst engines I actually ever saw internally were those using primarily Pennz or Quaker State. They developed a sickening "greenish-grey" sludge that was like a thick gooey mud that we labeled "Pennsylvania Mud". Of course, this does not mean using those particular "name brand" oils is neccesarily "bad", especially now after so many years of "progress". Changing oil frequently, especially when you use Pennz or Quaker, (in my opinion) surely will help.
Would be interesting to perform those tests on "modern day" oils, including the "synthetics". Anyone have current info on that?
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