Redline.

 

regarding: Limited Slip Friction Modifier in gear lube: use in Evo FLSTC tranny? To be clear exactly what lube:
On label of bottle QUOTE:
"Mobile 1 Synthetic Gear Lubricant LS 75W-90 with Limited Slip Friction Modifier Included" Label says nothing about motorcycles. (lists 7 characteristics including reduces friction, ease shifting, reduce chatter, minimal wear & spalling in high torque, resists oil breakdown, more).

My concern / question is the Limited Slip Friction Modifier. Good? Bad?
1. Is this okay for transmission, 1999 FLSTC Evo Softail Heritage?
(40,000 miles newly purchased August 2015, changing all fluids)
2. Is this the 75W90 people have been referring to?

I have 2 quarts of this and the bike is on the lift now. I'm willing; the hand that pours hesitates!
Advice, Wisdom Solicited.
THANKS, Kayakeur Bud
You may flog my dead horse!
(I searched BobOilGuy, got nowhere w search engine)

 

Think I'd go with Shockproof or HD recommendation, rather than a differential oil with friction modifiers. But I'm kinda conservative that way. Just my .02...

 

Some gear lubes and differential oils can be nasty to oil seals and not too great for any yellow metals. Not sure in the real world if that still happens. But even in real tests, the safest oil for yellow metals and seals is motor oil.
Again, from what I read, many gear oils have overcome this issue, Im just not sure if you want the best for the bike you would avoid them over a specific motor oil.

 

We've used/sold Red Line driveline lubricants here for about 2 decades now.
We do not have any need to look further.
Scott

 

I don't think there is any yellow metal in an HD trany.

 

I am about to change mine here in a few days. I am looking to put Lucas 75w140 gear oil in the transmission, unless you guys have heard that it isn't that great of a product...

 

Another Redline user here, and I can't find any reason to use another brand.

 

My Fat Bob had syn 3 and formula plus in the trans and primary. The motor was very noisy when warm and shifted ok but N was a pain sometimes. Bought Amsoil 20-50, primary, and trans fluid and did the change with Amsoil oil filter. I have put 200 miles on since I switched oil and all I can say is what a difference it has made. No more noisy motor the bike shifts smooth as butter and N is now there every time. I couldn't be more happy with Amsoil.

 

I'm sold on the redline shockproof. It scared the hell out of me when I first went to pour it in and saw the color of it tho. It really does noticeably shift smoother and finding neutral is now a breeze. I always felt like an amateur stopped at a long light flipping between first and second several times trying to get neutral but since the redline it's first time every time.