Primary oil
Ultimate HDF Member
Joined: Jan 2011
Posts: 9,850
Likes: 220
From: Sacramento, CA.
Hot. I tried Redline Syn in primary. It didn't take long & the clutch started to slip at high rpms, going from 4th, 5th & 6th. I had my dealership check it out. My tech wanted to show me what the oil looked like. It was some nasty looking dark brown & smelled burnt. He told me that's he's seen this several times. Went back to HD Formula+ & never had any other problems. I run RedLine Oil & Trans fluid & they are outstanding.
Road Captain
Joined: Sep 2013
Posts: 612
Likes: 4
From: Iowa
I'm switching because I think I'm getting a little slip in the clutch. I read some good things about formula + and figured I would try it as I have 2 bottles laying around from the last bike. I tried to get some Rotella 10/40 but the 2 shell stations I went to were out of it or couldn't find it....... we'll see.
Thread Starter
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Supporter
Joined: Oct 2012
Posts: 1,242
Likes: 1
From: Farmingdale, New York
Hot. I tried Redline Syn in primary. It didn't take long & the clutch started to slip at high rpms, going from 4th, 5th & 6th. I had my dealership check it out. My tech wanted to show me what the oil looked like. It was some nasty looking dark brown & smelled burnt. He told me that's he's seen this several times. Went back to HD Formula+ & never had any other problems. I run RedLine Oil & Trans fluid & they are outstanding.
Great info guys, thanks............ gonna get to it today. of course I'll heat it up first. I was being lazy. I get a little ride out of it also..........
Seasoned HDF Member
Joined: Oct 2012
Posts: 11,198
Likes: 3,028
From: St.Louis Mo.
why is this ? i would think mobil v-twin would be a better lube for the compensator.
Seasoned HDF Member
Joined: Mar 2009
Posts: 24,650
Likes: 9,112
From: Snow Hill, NC
I ran all kinds of **** in my tranny and primary and finally gave up a few years ago and now just use Formula Plus because i saw no change or improvements with other crap....so easy to keep 1 fluid designated to primary and tranny...As for changing it i like to run it for a while just to stir it all up. Is would seem that most of the crap would be better drained out that way...
Tourer
Joined: Aug 2013
Posts: 498
Likes: 0
From: Timbuktu
I think you need to review how oil viscosity, lubricity and Winter weight works in hot and cold temperatures. Just think, "why do air cooled bikes run 20W50, and liquid cooled bikes run 10W30/40"... Hmmmm
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Road Captain
Joined: Jun 2013
Posts: 692
Likes: 63
From: Ontario, Canada
plus 1 here.
Road Captain
Joined: Dec 2009
Posts: 570
Likes: 4
From: New Mexico
FYI, that oil should actually be thinner when cold as multi viscosity gets thicker as it gets warmer.
Wrong. The oil will only thin to the larger # when hot and thicken to the lower# when cold. The oil gets thinner when heated.
Wrong. The oil will only thin to the larger # when hot and thicken to the lower# when cold. The oil gets thinner when heated.