I just changed my oil at 2k miles from the OE to AMSoil 0w-30 SSO and the engine runs noticeably smoother than before... my Fiancee as well as my roomate also commented the same thing. I changed the oil in her MS3 to the same and her engine is MUCH smoother and the mileage is already much better on this tank. AMSoil is all I have used in my last 4 cars though so I am biased... it's just better oil IMO.
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