Thread: Straight 50W Oil in a 603???
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Old 12-04-2005, 11:03 AM
Hatterasguy's Avatar
Hatterasguy Hatterasguy is offline
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Join Date: Nov 2002
Location: Milford, CT
Posts: 19,323
Mobil 1 15w-50 is as heavy as I would go. I ran that stuff for a year, even in below zero temps starting was not a problem.

Now I switched to Delvac 1, it has all the latest CH ratings from the API. Seems like a slightly better oil.
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