What oils?

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Apr 14, 2023 | 07:46 PM

#11

Jackie Paper

Seasoned HDF Member

Joined: Mar 2010

Posts: 38,610

Likes: 6,439

From: Honah Lee

Reference

https://www.hdforums.com/forum/touri...for-07-rk.html

Apr 17, 2023 | 10:44 PM

#12

bklynbob

Grand HDF Member

Joined: Mar 2008

Posts: 4,998

Likes: 655

From: bklyn,ny

If you have an oil cooler, use any appropriate 20-50 oil, no cooler use synthetic. I like spectro gear and primary oil.

Apr 18, 2023 | 02:20 AM

#13

Jackie Paper

Seasoned HDF Member

Joined: Mar 2010

Posts: 38,610

Likes: 6,439

From: Honah Lee

Quote:

Originally Posted by bklynbob

If you have an oil cooler, use any appropriate 20-50 oil, no cooler use synthetic. I like spectro gear and primary oil.

That's a new one for me. Why would you not use a synthetic oil in a motorcycle motor that has a cooler on the motor? Be it the oil cooler or the antifreeze head cooled one or the old school just air cooled?

Or is your post just referring to the primary case?

Harley now has a synthetic primary fluid.

Even Harley has recommended synthetic for years in their motors as a first choice?

Last edited by Jackie Paper; Apr 18, 2023 at 02:33 AM.

Apr 18, 2023 | 07:30 AM

#14

60Gunner

Grand HDF Member

Joined: Sep 2017

Posts: 4,359

Likes: 1,219

From: Dubuque, IA

Quote:

Originally Posted by Jackie Paper

Harley recommends a lot of things they sell.and make money on. Who gives a fk?
They also recommend their street tuner. Would you buy one?
As for synthetic primary fluid...are you running an aftermarket clutch with Kevlar plates?