Zafar

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 .....

Haasman

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