tranny oil, just 80/90?

grantj · Post by **grantj** » Sun Oct 21, 2007 10:31 am

I currently have my tranny out of my jeep, due to broken clutch disc spring. Usually I will fill the tranny up with 80/90w oil, but are there some better lubricating oils for our old trannys?. My rebuilt tranny has only about 7K miles on it. thanks for your advice...grant j

hillbilly21 · Post by **hillbilly21** » Sun Oct 21, 2007 5:00 pm

I use 85w-90w in mine with about 1/2 pint LUCAS oil..helps me in my own mind to keep it from leaking..

maeserik · Post by **maeserik** » Mon Oct 22, 2007 1:37 am

what do you mean by 'lucas oil' ? some additive ?

Erik

dv3468 · Post by **dv3468** » Mon Oct 22, 2007 9:05 am

Maeserik:

Go to the Willys M Jeeps Forums and search down to the Wed, August 15, 2007 blog entitled " Transfer Case Fill & Quantity". Check out page two. There is a photo of ther Lucas Oil bottle.

FYI. Dennis

Post by **wesk** » Mon Oct 22, 2007 8:10 pm

http://www.willysmjeeps.com/v2/modules. ... 6&start=15

maeserik · Post by **maeserik** » Tue Oct 23, 2007 1:49 am

thanks wes

Erik

grantj · Post by **grantj** » Tue Oct 23, 2007 9:56 pm

thanks for recommending Lucas oil, I've seen it at a local auto parts store..grant

Bob_C · Post by **Bob_C** » Wed Oct 24, 2007 8:30 pm

I'm not sure if I would recommend that guys.
I'm not a chemical engineer, but my feeling is that if it was designed to run with 80-90w oils, that's what should be running in the gearbox / engine. In my humble opinion, I wouldn't put additives like Lucas Oil in it. To me, they're not worth there money.

I seem to recall doing some reading a while back about these oil additives, and I seem to remember clorine and teflon being major components, both of which can be terrible for an engine (teflon can clog passageways and chlorine is corrosive (as it is very reactive).

A quick google search reveals this experiment done by this guy.
http://www.bobistheoilguy.com/images/lucas/lucas.htm
This guy basically says Lucas does it's job of getting oil to move, but it creates a ton of air bubbles. Since air bubbles are not oil and cannot lubricate, that's a bad thing. I imagine this would be a simular to a situation where you had too much oil in your crankcase, and thus your crankshaft kept splashing it, foaming it up.

Post by **wesk** » Wed Oct 24, 2007 10:07 pm

Good points Bob. I am not an additive guy either. But I treat the additive topic like witch craft. Some folks get downright upset when you tell them there's no scientific data to support any improvement in performance or increased life expectency with these witches brews. So I just let them believe what they want. My plain jane lubricants have done me well since 1960.

topfueler1 · Post by **topfueler1** » Sun Oct 28, 2007 3:28 pm

I use the best Amsoil 100% synthetic severe duty gear oil 75-90W. In the trans., trans. case, and differentials. She'll shift smoother for you.