STP Blue Bottle
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
My uderstanding is at that mix ratio, it would make a 5W-30 be more like a 10W-40.
So it's not the kind of additive to be mixing in a crankcase lube & expect it to do it's protection thing on cold starts.
So it's not the kind of additive to be mixing in a crankcase lube & expect it to do it's protection thing on cold starts.
Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
15W-50 is a synthetic viscosity. If oil burning is the issue, why not just switch to 20W-50 dino? While it may be the same at 210F, it will be thicker at any temperature lower than that and most engines dont run at high an oil temp anyway. Ive never understood the logic in using STP, Lucas, etc, instead of just going up in viscosity of the oil itself.
Jim
Jim
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