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Message: <blockquote data-quote="NERD" data-source="post: 538180" data-attributes="member: 8956">5w20 is fine. Now for someone like me that's constantly over 214* at the track I should run 0w30.Here is a few viscosities per temp. (Now remember that 90% of all engine wear is durring initial start up)Oil type.. Thickness at 75 F ..Thickness at 212 FStraight 30..........250....................1010W-30...............100....................100W-30.................40.....................10Straight 10..........30.....................6Straight 5...........20.....................4Straight 2...........15.....................3Straight 0...........12.....................3 est.Different brands have different additives than have different wear characteristics mixing brands can dilute and screw up the engine.""It is time to dispel the notion that 0W-30 oil is too thin when our manual calls for 10W-30. A 0W-30 is always the better choice, always. The 0W-30 is not thinner. It is the same thickness as the 10W-30 at operating temperatures. The difference is when you turn your engine off for the night. Both oils thicken over the evening and night. They both had a thickness, a viscosity of 10 when you got home and turned your engine off. That was the perfect thickness for engine operation. ""</blockquote>