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HD Rider · 11-10-2018, 05:52 PM

Pretty much all motorcycle oils are GL-1 rated. If you're looking for a 90 weight gear oil equivalent, you can get a straight SAE 60 from Harley Davidson or Amsoil. I'm not sure about other brands. I was planning on running 20w-50 mc oil in my transmission.

11-10-2018, 05:52 PM	#28
HD Rider Senior Member Join Date: Oct 2018 Location: Glendive MT Posts: 155	Re: GL 1 tranny oil Pretty much all motorcycle oils are GL-1 rated. If you're looking for a 90 weight gear oil equivalent, you can get a straight SAE 60 from Harley Davidson or Amsoil. I'm not sure about other brands. I was planning on running 20w-50 mc oil in my transmission.