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Why no love for M1 gear oils? #5191358 08/19/19 02:02 PM
Joined: Nov 2013
Posts: 379
zuluplus30 Offline OP
OP Offline
Joined: Nov 2013
Posts: 379
Searching the threads I see lots of negativity towards M1 gear oils (not Delvac). Anybody care to shed some light? Getting ready to change my Silverado again w/ G80 locker and already purchased M1 75w90 for the job.

Re: Why no love for M1 gear oils? [Re: zuluplus30] #5191369 08/19/19 02:15 PM
Joined: Oct 2010
Posts: 7,727
A_Harman Offline
Joined: Oct 2010
Posts: 7,727
I did a complete fill of M1 75w90 (7 quarts) in the Dana 80 in my Dodge. Even though the bottles said that it was for limited-slip differentials, the rear end would chatter in tight slow-speed turns. So I bought the LS additive separately; 2 4-oz bottles and problem solved. On other fills I have used Walmart Supertech, and didn't have a problem with limited-slip chatter. So I avoid M1 gear oil.

2008 Dodge Ram 3500 diesel/G56
1985 Z51 Corvette track car 355/6-speed
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1972 GMC 1500 shortbed project truck 307/SM465
Re: Why no love for M1 gear oils? [Re: zuluplus30] #5191389 08/19/19 02:35 PM
Joined: Jun 2002
Posts: 20,910
MolaKule Offline
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Sorry guys, these "No Love" threads just create ridiculous bickering.

I'm a Student Pilot. Frightening, isn't it?
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