I am gonna change oil in all 3 holes. I have been searching the tech sections for a while and seriously I am kinda blown away with all the choices. What do you guys who wrench on your own bikes use! My last two engine changes were HD oil. I think I am gonna go synthetic. Do you guys use ATF in the trans?

Thanks In advance

Shawn

 

Lucas 20/50 motor and primary. Lucas 75/90 syn gear oil in the trans. Wix oil filters.

 

You will get a bunch of answers!

I use Mobile 1 V-twin 20/50 in the engine. Redline HD shockproof in the tranny, and HD formula in the primary case.

ATF is only for automatic transmissions. You need a heavier gear type lube, for gear to gear setups.. gear to gear = heavy shock load on the meshing gear tooth faces.

Basically, a good synthetic for the engine: Mobil 1, Amsoil..... A good synthetic for the tranny: Redline, Mobil 1, Amsoil, and a good basic dino for the primary. The reason for not using a synthetic in the primary, is it may cause clutch slippage because synthetic oils are a bit more slippery.

If you are going to use a filter other than Harley premium, make sure that it handles down to 5 micron. Harley filters do... not sure about the others.

 

Redline in all three. I use their V-twin engine oil, Shockproof V-twin trans oil and V-twin primary oil, and HD filter.

I order it all from here: http://www.racerpartswholesale.com/c...y/Red_Line_Oil

(except for the filter of course)

I also use Redline in my car's transmission, transfer case and rear diff.

 

That issue is up for debate too. I run synthetic (Royal Purple) in the primary specifically for that reason. If you do a lot of slow speed maneuvers, or are stuck in rush hour traffic, slippery oil is cheaper than a clutch.

 

Amsoil 20-50 in the case and primary.HD transmission oil in the gearbox.Amsoil filters.

 

Really good point.

I guess it would depend on what your major mode of operation is: mostly in town (more clutch action) or mostly cruising (less clutch action).

 

That's really an old wives' tail that has been disproved many, many times.

There may be other valid reasons not to use a particular synthetic fluid in the primary, but the fact that it is synthetic (be it primarily PAO, Group III Hydrocracked, or some combination of both) is not one of them.

 

This is what I use below:

Amsoil 20W-50 in the engine & primary
http://www.amsoil.com/storefront/mcv.aspx

Amsoil Severe Gear 75W-90 in the trany
http://www.amsoil.com/storefront/svg.aspx

AMSOIL Preferred Customers SAVE
http://www.amsoil.com/a/wholesale-preferred-customer

Harley oil filters P/N 63798-99A (chrome) or 63731-99A (black) from
http://www.chicagoharley.com/shop/
or
https://www.zanottimotor.com/shopping/partLookUp.html

 

Here's what I'm running.