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Old 07-18-2019, 10:20 AM   #20
philipswanson
Senior Member
 
Join Date: Oct 2015
Location: Bonita, CA
Posts: 1,374
Default Re: Mixing synthetic and regular oil

All motor oil is compatible. That's an SAE requirement. Since I have a '40 with no lip type main seal, I run straight 30W Rotella. That 10w, etc. wants to drip out the rear. 30w doesn't. No freezing in San Diego so it's fine. You can mix weights, synthetic, etc. No problem.
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