My primary currently has Formula+ in it, but it's about to get a dose of conventional Rotella T 15W40 which is JASO-MA certified. I figure it's great (dare I say legendary) oil that is about half the price of Formula+. That said, I have no problems with Formula+ and would run it again.

 

Humm, I didn't know it was a Citgo product. Kinda funny, not much would make me switch to another alternative....but hugo chavez and his anti american BS just might be enough.

 

Thats just one of the reasons I don't buy any of the petroleum products from HD - The other is that there are much higher quality products available.

 

+1 50w with weak additives. A real money maker for the moco.

 

So from experience what is the best to put in the primary that will not mess with the clutch plates? B/c I have amsoil 20W-50 in the motor and sever gear 75W-140 in the trans. Is the trans. weight good or should I move down to the 90? Thanks

 

If you want to stick with Amsoil you could use 10W40 MC oil.

 

In the primary?

 

=
Well, that fact surely eliminates the use of HD oil for me.

 

Trans oil is fine- any gear oil will suffice. Harley spec's Syn 3 20W-50 or Formula+ with 20k mile OCI, so obviously it's not an overly hostile environment. Even el-cheapo gear oils are designed to be put in heavy truck differentials & run for 50k miles plus, so our little gearboxes won't put a hurtin' on any decent gear lube.

Primary is good with Formula+, ATF, Rotella 15W-40, or any motor oil (like 10W-40 or 20W-50) without moly as an additive.

 

Thanks for the reply. I was thinking about amsoil 10W-40 or Super Shift Racing Transmission Fluid SAE 10W