How long have you let the oil go in the primary and transmission before changing?

 

I do mine everything 5k but u can go longer in the trams especially

Just what I do

 

Harley says to change primary fluid every 10,000 miles and trans fluid every 20,000 miles. I got my dyna back in March and plan on doing both every 10,000 miles.

 

I put a good synthetic in the tranny, and I'm not gonna change it, ever. I'll do the primary every 10k miles with formula +.

 

I stick to the factory intervals. After speaking with the guys who are responsible for designating those intervals, I agree with their reason.

If anything, you can go longer because of the safety factors built in.

 

With a good Syn gear oil I'd keep it in the transmission for 20-40 thousand miles! The primary I change out every 5K cheap insurance!

 

What reasoning would that be?

I use synthetic too but do less than 10,000 miles a year on the bike. That would work out to me changing the primary and trans about every 1.5 years or so. If I waited 20,000-40,000 miles to change the trans fluid, it would take me 3 or 4 to 7 or 8 years and I don't believe in leaving any oil in that long, no matter how good the fluid is.

 

I do all three holes at the same time.
On my bike.

Every time I change oil, I change transmission and primary too.
It is already on the jack and the tools are out and my hands are already greasy.

I run my bike for hours on end at higher speeds. A little extra care doesn't hurt.

 

I take mine to the shop every 5k and they do the magic. That's what the manual shows...every 5k.