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I use Rotella Triple Protection.
Just as an aside....two GMC dealers and multiple GMC techs tell me there is nothing to lube on 2013 3500HD front end. I will look for myself but can this be true?
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Chris and Patty 
2015 Keystone Montana 3791RD Legacy Edition, MorRyde 4000, Dual pane windows, Goodyear G rated tires.
2013 GMC Sierra 3500HD, Duramax, SLE, SRW, Crew, Hensley Trailer Saver hitch, Blue Ox BedSaver.
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