Castrol GTX is my first choice. Never had any issues with it.

I'm gonna use harley syn on my current bike,along with their trans and primary oils for now at least until ESP runs out.

Then Ill switch to a full syn and one of the many options for trans and primary!

I believe for most folks any of the oils would do just fine..trick is changing them and filters when your supposed to.

syn in all 3 holes

UPDATE-
I noticed the old post I did - GTX is a great product but I switched out all my fluids to Synthetics a couple years ago. I see the bike runs cooler. The syn is pricey so it must be better

Amsoil full syn all holes 06 ultra last two changes. Seems to run a little cooler. Happy so far.

Local Harley dealer just closed here where I live,can't get Harley oil. Does anyone have experience of REVTECH,oil?
Likewise what spark plugs are popular with you guys? I have a 1998 dynaglide with the 1340 evo motor.thanx rod UK.

Hey Rod,
I'd think you can get pretty much anything online these days. Costs??? As for oil brands, I used Castol GTX for years in my bike. I switched to Mobil 1 Full Syn for V-Twins a few years back. The only difference that I can tell is it costs 5 times as much.... I know it's supposed to last longer but it gets just as dirty - just as quickly - as the GTX did. I'm thinking about going back to the GTX and just using the Synthetic in the Transmission and Primary.

Spark Plugs:
I know you can get spark plugs online, just do a search for them.

Thanx rk,hope allis well with you rod