anyone recommend using mobil 1 20w50 full syn in your primary and transmission...i have a 2000 electraglide with 50k..could use some advice.

 

I would recommend Mobil1 75-90 in your tranny and a good 10-40 oil such as Castrol GTX in the primary. Save the 20-50 syn for the crankcase. Syn in the primary is a pure waste of $$$.

 

I put Mobil 1 20W-50 in all three holes at the second change around 1400 miles on my bike. It's still in the engine and primary. In the trans it made too much noise for my liking (clatter at idle with the clutch out in nuetral). I changed the trans to Mobil 1 75W-140 and I'm much happier.

 

keep the motor oil in the motor, put gear lube in the gearbox.

 

i kinda figured...i ask cuz the mobile 1 rep swears it wont hurt anything..anf the oil exceeds HD recommended fluids...thanks for the info.

 

I got it in all three holes... no problems at 17000 miles...hot here in sc as well...good luck...

 

+1; good advice. Never understood why anyone would pay synthetic price for primary lubricant. Not to mention the additives that are in the synthetic that don't belong in the clutch. ATF is also an alternative to conventional motor oil in the primary. I have read that some guys have had good results with the synthetic gear lubes in the trans; smoother shifts and less "clunk" but haven't tried it myself.

 

my choice for the primary is anything that says ,v twinn or motorcycle,these dont contain friction modifiers wich can cause clutch slip.but usung vtwiin in your motor is a waste of money and the friction modifiers(that they dont have) are good in the motor.

 

I run Mobile one 75w90 in the trans and have really good luck with it. Lots smoother and quieter. Crankcase and Primary both get Mobile One 20w50.

 

I have read other threads where people were saying they can run any kind of oil in the primary and the clutch will be happy. I just replaced the compenator in my '08 RKC. I have always used synthetic in the primary (Started with Amsoil then switched to Mobil 1.). I was surprised by the amount of wear shown on the compensator. There were significant grooves worn where the ramps made contact. The clutch may be able to run on any kind of oil but the compensator clearly needs the slipperyest (Is that a word?) oil you can feed it.