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I would personally run 10w40 at the least for general street use (i mean 90 degree summer days). I think 10w30 is much to thin in the summer, winter is no big deal.
I would be even more inclined to run 10w50 in the summer, but that is only available in M1 (or synthetic in general) i think.
If you do hard driving (auto-x, DE) i would defenetley not run anything less than w50. Running hard for 60 seconds, then sitting in staging for 5 minutes and repeating that four or five times before you shut your car off leads to super high oil temps, especially in the dead of summer with 90 degree ambient temp. Ive seen as high as 240*F on my car with the oil pressure at about 2 bar with 20w50. I would of probably had around 1 bar (if that) running anything less.
The other advantage of heavier oils is they will reduce your oil consumption somewhat. But again, that really only comes into play if you drive your car real hard.
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Jon
1988 Granite Green 911 3.4L
2005 Arctic Silver 996 GT3
Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1
Last edited by Techno Duck; 03-12-2007 at 07:25 PM..
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