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Old 05-22-2003, 02:54 PM
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haasman haasman is offline
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Join Date: Jun 2001
Location: San Francisco, CA
Posts: 3,096

Thank you for you research.

I have to say that driving with 10W-30 in the summer just gives me a bad feeling (very unscientific!) It seems too thin.

The GM concern regarding rapid polymer deterioration in the 10W-40 oils is something I have heard repeatedly, even before seeing it here.

I am thinking of going either to a 20W50 or 15W-40 .....

'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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