TwinTurbo.NET: Nissan 300ZX forum - The real issue is what is the GL rating, not so much the
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Subject The real issue is what is the GL rating, not so much the
     
Posted by Denis on April 06, 2023 at 12:56 PM
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In Reply To So what's the verdict on 75w90 vs 75w85 tranny oils? posted by ZXoltan on April 06, 2023 at 12:14 PM
     
Message Weight. The transmission needs GL-4 due to brass syncro's, GL-5 has elements needed by hypoid gears and those elements are corrosive to brass.
MT-90 for example is GL-5 & MT-85 is GL-4, brands can vary as to weight and GL rating.
The thicker the weight, the harder shifting can be when cold when talking about 75W and up.

     
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