View single post by Steve Duncan
 Posted: 09-27-2017 12:35 am
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Steve Duncan


Joined: 09-12-2011
Posts: 7
I've been spending way too much time trying to figure out what type of 90 wt oil to use in the differential.  It seems EP qualities are a must, but I'm unclear about concerns that these additives will harm yellow metals. Are there any brass or copper components in the differential to be concerned about? If not, then GL-4 or GL-5?