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I am looking to change my gear lube. I’ve been using the Redline 75w90ns. I’m looking for input from any of you guys that have tried both the MTL and the 75w90ns. Searching the forum it looks like some of you may have tried both but I have not found any real world comparison in the ZF. 




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I've been using MT-90, simply because I'm afraid to use a GL-5 lube. I'm about to try Amsoil synthetic 75W-90 GL-4. Mind you, I don't expect to feel much of a difference. In the document below, Pennzoil synthetic 75W-90 GL-4 comes out on top but I haven't been able to find it in a quantity less than 5 gallons. 


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Transaxle_oil - GL-4 vs GL-5

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