Rotella T ????
Outstanding HDF Member
Joined: Dec 2007
Posts: 2,415
Likes: 197
I have always liked Rotella T 15-40 in the primary because it does not contain any friction modifiers in it. I also like it because it is light enough to provide lubrication to the compensator. Another excellent choice would be the Harley primary case lubricant from the dealer.
I use Rotella 15-40 in my crankcase as well so the use of it in the primary is handy.
I like a light gear lube in the transmission, usually a 90 wt. or less because I feel that something like a 140 is just too thick for a motorcycle. If you had an 80,000 pound Kenworth motorcycle I would say a 140 wt gear oil would be called for, but not with a 1000 pound Harley.
This is just my personal preference and I am absolutely positive that every other swinging Richard out there has his own preferences.
I use Rotella 15-40 in my crankcase as well so the use of it in the primary is handy.
I like a light gear lube in the transmission, usually a 90 wt. or less because I feel that something like a 140 is just too thick for a motorcycle. If you had an 80,000 pound Kenworth motorcycle I would say a 140 wt gear oil would be called for, but not with a 1000 pound Harley.
This is just my personal preference and I am absolutely positive that every other swinging Richard out there has his own preferences.
Last edited by TN Houndog; Jun 9, 2016 at 07:07 PM.
Extreme HDF Member
Joined: Jun 2011
Posts: 10,216
Likes: 224
From: Glendale AZ
I know it's an older thread but I should add to the database that I've been using Rotella T6 in my primary since I had my Road King in 2011 and everytime I crack open the primary case to inspect my Attitude Adjuster for excessive wear, its looks brand new in there. Granted I never go more than 3-4k on changing it out. I put Formula+ in my Roadster when I did my 2k service but I've got a quart of the T6 ready to take its place in the near future. The primary and the tranny share oil (dont care for that engineering but it is what it is) so having a solid lubricant to share between the two components is vital in my opinion .
I have used Formula Plus for years in the Transmission & Primary, I put Royal Purple in my Engine
In my opinion, Rotella is a good oil to use in Primary and Transmission most cases, anything used in diesel industries I am good with.
In my opinion, Rotella is a good oil to use in Primary and Transmission most cases, anything used in diesel industries I am good with.
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