Tranny Fluid

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May 1, 2011 | 12:01 PM

#11

Mascman

Outstanding HDF Member

Joined: Apr 2006

Posts: 2,555

Likes: 3

From: Clarksburg, PA

Quote:

Originally Posted by rounder

I think my service manual for my 05 states 20K for primary and tranny oil. I do it every two oil changes or once a year. I am using Amsoil 20w50 right now... gonna try redline gear oil and primary oil next change.

I am going with Redline fluids this time too...cost almost $80 with a filter.

Hope this is good stuff!

I bought the specific Primary and Transmission fluids...wonder if they are really any different? Just went with their engine oil too.

May 1, 2011 | 02:57 PM

#12

CSS_FXD

Road Warrior

Joined: Apr 2011

Posts: 1,824

Likes: 6

From: MN

Well I'm new to big v twins but doesn't the 20-50 mobile 1 v twin oil cover all three when you drain and re fill?

May 1, 2011 | 03:47 PM

#13

bikerlaw

Ultimate HDF Member

Joined: Jun 2007

Posts: 9,193

Likes: 494

From: Richmond, VA

Quote:

Originally Posted by CSS_FXD

Well I'm new to big v twins but doesn't the 20-50 mobile 1 v twin oil cover all three when you drain and re fill?

No, putting an automotive motor oil like 20-50 in the primary where your clutch is, is not the best choice. At least thats my opinion. Harley sells primary fluid as does Amsoil and a host of other suppliers and I don't think any of them are 20-50 motor oils.

May 1, 2011 | 03:50 PM

#14

PigInaBlanket

Club Member

Joined: May 2006

Posts: 10,815

Likes: 16

From: Virginia

Yes you can use Mobil1 20W50 V Twin in all 3 holes.

My manual says tranny every 20,000 miles
Primary every 10,000 miles
Engine every 5,000 miles

I do what the manual says, for fluid change intervals anyways.

May 1, 2011 | 04:01 PM

#15

Spanners39

Seasoned HDF Member

Joined: Dec 2010

Posts: 7,736

Likes: 1,524

From: Coromandel Peninsula New Zealand

I use Spectro Gear Guard in the tranny and change once a year, Harley primary fluid in the primary and change once a year and Any 20/50 I can find in the motor and change every 5000.

May 1, 2011 | 04:36 PM

#16

tinker1

Road Captain

Joined: Feb 2007

Posts: 684

Likes: 1

From: Colorado

Quote:

Originally Posted by bikerlaw

I change all three at the same time. Why, cause I'm funny that way, its cheap, easy and it can't hurt the bike. I use the Harley tranny/primary fluid and split the bottle in half. Then I add 25% (5 oz on and evo) Lucas oil stabilizer and 25% (5 oz) Mobil1 synthetic gear lube. Works for me.

Holy cow! Are you some kind of chemist?

I change engine oil every 2500 miles, tranny & primary every 5000 miles. I use the harley fluids.

May 1, 2011 | 05:02 PM

#17

bikerlaw

Ultimate HDF Member

Joined: Jun 2007

Posts: 9,193

Likes: 494

From: Richmond, VA

Quote:

Originally Posted by tinker1

Holy cow! Are you some kind of chemist?

LOL, no. I have just heard so many debates about so many fluids I am determine to include as many as possible in my concoction. That way, if it ever comes out that there truely is a "best", I will probably have been running it all along.