11-21-2019, 11:38 AM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,457
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Quote:
Originally Posted by hauss
I would say Delo 15/40, change it often and it will provide all the protection you need.
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That might not be the best advice for a Windsor engine.
At 0*C, a 15w-50 oil has a viscosity of 1328
At 0*C, a 0w-30 oil has a viscosity of 475.
During a cold start, I would certainly want the lower viscosity. Get that oil up and moving as quickly as possible.
As for a 50 weight oil, a well built Windsor just doesn't need it. It should easily be able to maintain proper oil pressure with a 30 weight. The viscosity difference at 100*C is about 80%. It takes energy to move that extra thick oil around.
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