Favorite Primary Lube Harley Transmission, Harley Clutch & Harley Primary Discuss Favorite Primary Lube in the Harley Tech & Harley How-to forums; A lot of people are interested in what lube they run in ther Harley's cases, but I seldome hear much about the primary lube. What do you run and how ...

[Buzz Kanter]

A lot of people are interested in what lube they run in ther Harley's cases, but I seldome hear much about the primary lube.

What do you run and how often do you check and/or change it?

[Frankie42]

I run Red Line Synthetic in the Primary. You can order from Red Lines Synthetic Oil Corp. 6100 Egret Court, Benicia, CA 94510 800.624.7958
SkU # 90226 V-Twin Power Pack: Big Twin 20W50 Power Pack. It contains all the different lubes for all 3 cases. $69.95
Hope this helps:

[lowrider01]

I run Amsoil synthetic in my primary.use their gear oil for my tranny,fork oil in my forks....

Red Line. Used in all three holes, 20-50 in crank, v-twin primary and v-twin transmission with shockproof. Used right after break-in. Only oil I'll ever use.

[94flhtcu]

Revtec in all 3. As far as servicing, trans and primary once a year, at the end of the year. Engine oil at 2500.

[humpbackbob]

Just switched to Amsoil, for all three. Dealer carries it in the Parts Dept. After several recommendations gleaned from here, I asked the Parts guy. In a "Low Stage Whisper" he said, "Go for the Amsoil". Good enuf fer me

[Gunnert]

Amsoil ATF synthetic

[Ed. Hugo]

I use Mobil #1 15-50 in all three holes or Amsoil when I can locate it. I change everything every 3000 miles & enjoy doing it.

Red Line, Red Line, Red Line

Mobile one.