Engine - Red Line 20w50
Tranny - Spectro Heavy Duty Platinum 6-Speed 75w-140
Primary - Shell Rotella T 15w-40

 

Thanks for the info everyone! I was leaning towards amsoil in the first place. Running that in the sportster and am happy. Probably gonna order me a case of it for the softail now.

 

Rotella diesel oil in the primary? That's a first lol.

 

+1... thats what I've put in for since the 15k service.. and I like it. Now with 42k on our 07. Still use the HD filters.


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Wow, pretty interesting responses. I see most everyone has gotten away from the "I run the Harley oil, cause thats what I am supposed to do" mentality. There was a time when these threads were littered with just that response.

20/50 Castrol in the engine
ATF (Ford) in the primary
75/90 Mobil 1 Gear Lube in the tranny

 

Engine - Mobil 1 20w50 V twin
Primary - Mobil 1 20w50 V twin
Tranny - Just switched to AMSOIL Severe Gear 75W-90 and she shifts like butter! Extremely happy with that change.

 

 

Where do you guys usually get amsoil from? Can't find it anywhere here in mass.

 

>> Rotella diesel oil in the primary? That's a first lol.

Not as strange as it may sound... I know several people who use Rotella T in their primary. It works well there. It's cheap compared to other products. It is JASO-MA (wet clutch) certified. I tried it after reading many primary fluid threads on this forum. Check it out!

 

When I said all oils are compatible, I meant they will all mix without problems. That does not mean they are created with the same service designation. Just that they will mix with each other without creating a chemical reaction. If they didn't you would have to flush your engine before changing brands, and I don't think to many do that.