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Bob Bidonde · 09-18-2020, 08:57 AM

Denali, the stuff sold as M-353 600W foams badly and should not be used in a transmission or differential. I have been using SAE 75W-140 successfully. You should use the gear oil typically used in modern Alaskan cars. Current oils are far superior to those of the past.

09-18-2020, 08:57 AM	#3
Bob Bidonde Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 3,466	Re: 600w vs 90w Denali, the stuff sold as M-353 600W foams badly and should not be used in a transmission or differential. I have been using SAE 75W-140 successfully. You should use the gear oil typically used in modern Alaskan cars. Current oils are far superior to those of the past. __________________ Bob Bidonde