Never had a problem with it myself and I've been using Mobil 1 since I got the car
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I oscillate between mobile and castrol (and the occasional valvoline), all in 5W-30. That said, I cannot say I have ever noticed a difference (given the problems my gtp has had I always keep a close ear on engine noise). Next time, I do an oil change Ill use mobil and see if I can hear anything!
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