Glen:

It's my understanding that cars from '92 on up are designed to work with the lighter oils. 0W-30 would probably do nicely in your
MB, especially in the winter months. I see
your in the Chicago area. Summer I'm not sure about and I DEFINITELY wouldn't put it in your vintage Chevy in ANY waether. Regards.

Mike Murrell
'91 300-SEL
Boerne, Texas

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Mike Murrell