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If an oil remains clean (mostly "virgin") after several thousand miles I would have to question how well its doing at removing contaminants from the motor.

2012 F150, 5.0 with 82K miles. I've found that my motor also prefers thicker oils. If I use SuperTech 5w20, the motor is noticeably noisy at hot idle. Tried Quaker State Full Synthetic 5w30 last OC and the motor was as quiet as the day I bought it, at least for the first 2k miles, but then it...