CVO Technical > Drive Train
Transmission Fluid 20W-50 vs 80W-140
17 StreetGlide CVO:
I have used both in the past, want to stick with just one going forward.
J.D.:
I like 75w-140 synthetic in the tranny, and I've tried most everything.
rayson56:
Redline Heavy Shockproof!! I've used it for years with great success. Probably overkill but I change it with the other fluids at 5k intervals.
https://www.redlineoil.com/heavy-shockproof
grc:
Actually, 75W90 is what's specified. Btw, a 50 weight motor oil is equivalent to a 90 weight gear oil in terms of viscosity. Motor oil and gear oil have different standards and specs.
If you ride in a colder climate, the 140 weight gear oils can be too thick to flow and lubricate properly in a Cruise Drive trans. If you only ride in very hot areas, it should be OK.
Jerry
longlast:
75W90 works in mine with no issues will change it at 15,000 got 6,000 to go
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