Which Redline oil for Sportster trans?
Big Kahuna HDF Member
Joined: Feb 2006
Posts: 23,881
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From: USA
RE: Which Redline oil for Sportster trans?
I like the MT90. It is a 75w90 manual trans lube with no moly to mess with the clutch. Thicker version of MTL. I use a 50-50 mix of MTL & MT90 in my primary...works great! But either the MT90 or 75w90NS will work fine. The 75w90NS is the 75w90 without the limited slip differential friction modifiers.
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Cruiser
Joined: Aug 2007
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RE: Which Redline oil for Sportster trans?
I just spoke with Dave, an engineer at Redline, who says the companies official recommendation for the Sporter trans is the 75-90. Not the NS version and not the MT90, although he did say that those would work as well.
Big Kahuna HDF Member
Joined: Feb 2006
Posts: 23,881
Likes: 34
From: USA
RE: Which Redline oil for Sportster trans?
ORIGINAL: homefront
I just spoke with Dave, an engineer at Redline, who says the companies official recommendation for the Sporter trans is the 75-90. Not the NS version and not the MT90, although he did say that those would work as well.
I just spoke with Dave, an engineer at Redline, who says the companies official recommendation for the Sporter trans is the 75-90. Not the NS version and not the MT90, although he did say that those would work as well.
75w90 = 16.4
75w90NS=15.6
MT90= 15.6
MTL= 10.6
My 50-50 MTL/MT90 Frankenstein blend= 13.1
HD formula + = 15.0
Hi Temp ATF= 10.0
Mobil1ATF= 7.8
So both the MT90 and 75w90 are a bit thinner when hot than the regular 75w90 which should make your clutch action a bit better. The 75w90 & 75w90NS are a GL5 while the MTL & MT90 are a GL4 rated gear oil. Both exceed the Harley requirement for lubrication. You can see where their thickest ATF is very close to MTL.
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