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I’m new here and I wanted to know if somebody could tell me what kind of oil do I use on my rear axle on my 1997 GMC suburban C1500 is it synthetic or regular
 

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I use Valvoline High Performance Gear Oil 80W90 on my 02 c1500 and my 95 Silverado. Both have Detroit Truetrac's though which calls for dino-based oil, not synthetic. Have had absolutely no issues with either using the dino-base oil. Probably use the same Valvoline stuff when I swap in the 14b ff with a G80 too.


Brian
 
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