Can I use Lucas 20W-50 in the trans & primary. It says so on the bottle just wondering what you guys thought. 2006 Deluxe

 

Probably OK IF there are no friction modifiers (teflon, etc.) in the oil that could effect clutch operation. BUT why use expensive , synthetic engine oil in the primary when plain old one dollar Type F atf will work as well and is designed for wet clutch plates?

Of course, I also like transmission specific oil like Redline HD Shockproof or Amsoil trans oil in the tranny. Go figure!

 

It should be ok in the primary but I only use a gear oil in the trans. I have yet to see anyone switch back to motor oil in their trans once they go to gear lube.

 

I've been using Amsoil 20/50 in the trans and it shifts like butter.If everything is adjusted properly you wont need extra heavy oils to mask a problem. Just dont use oils that say they are "energy conserving", in the primary your clutch might start to slip.