What oil

[jakeh937]

What's the best brand and weight oil for Transmission /tcase? T-18 and Dana 20 .


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[Lumpy Grits]

I have used Sta-Lube 85w90 GL4 for decades.
LG

 

[JeffP]

I have used Sta-Lube 85w90 GL4 for decades.
LG

Gee LG... you should consider changing it more often.
Every 10 years or half million miles, whichever occurs first.

 

[Belizean]

Gee LG... you should consider changing it more often.
Every 10 years or half million miles, whichever occurs first.

He only has a few hundred miles on it. Keeps it above the fireplace on the mantel.

 

[Scorzany]

Some notes on various fluid topics after doing extensive research and all this applies for the most part to original equipment recommendations and for my Jeep specs. Not going into detailed reasons why unless someone asks:

Transfer Case Oil:

Same as differential. Valvoline 80W-90 Conventional Gear Oil w/ Limited Slip GL-5 #VV831. Do NOT use synthetic for oil changes. My Transfer Case is a Dana 300 .

Transmission Fluid:

Redline MT-90 75W90. GL-4. No one locally carried this or anything just GL-4 rated. Had to order. Only use GL-4 rated. Something about sulphur compounds in GL-5 not being good for brass parts on these older transmissions. I have a T177 4 speed manual transmisstion.

 

[JeffP]

He only has a few hundred miles on it. Keeps it above the fireplace on the mantel.

Considering he’s kept it going since the beginning of time, I’m inclined to trust his opinion.

 

[Lumpy Grits]

If you run a T-4 or T-5 Transmission . Use a good 75W90 syn gear oil.

LG