Which oil for the dana 80?

[BarlowCummins]

I am getting ready to change the oil in my diffs, and i was wondering what are you all running? I am going to go with royal purple again but i am not sure which ones. RP has a 75w90,75w140,and85w140, i ran the 75w90 with no problems before but i tow almost everyday and the trailer is at max weight for the truck so im not sure which oil is best for the dana 80.

 

[Turbo Thom]

I've been runnin the Amsoil 140 since the last change. I really don't know what the difference is inside the chunk but the temps seem to me to run a little hotter. With the 90 wt most times it would stay at 180 and seem to take forever to get there. Now it soes to 180 pretty quick and when I tow, 15K, it will go on up to 190- 200. I think next change I'm going back to the 75w-90. For some reason it seems to work real well . Somewhat cooler anyway.



. . Preston. .

 

[RustyJC]

For heavy towing applications, Dodge recommends a 75W-140 synthetic. We tow a 13,500 lb 5th wheel that puts us on the road at 10,380 lbs GVW (10,500 GVWR) and 21,180 lbs GCW (21,500 lbs GCWR). I changed over to the Royal Purple 85W-140 synthetic at about 4,000 miles and could really tell a difference. The differential was much quieter and runs cooler. I'm a happy user.



Rusty

 

[BarlowCummins]

I think i'll go with 85w140 for the rear but any input you guys have would be helpful. corey

 

[y-knot]

I always go with the Amsoil 75W-140 series 2000

 

[Hohn]

Go with the Redline in gear oil. It's kind of their "signature product", so they put a lot of effort into it.



I would also be very comfortable with the RP M1 and Amsoil gear oils.



Justin

 

[dresslered]

I'm sticking with the LE607.

 

[fyrescott]

I changed to Redline diff. oil 85-140 and love it. No need to add a friction modifier, it's all ready in there.

 

[WELDER7014]

I just changed my diff oil at 54k and used Amsoil 75-90w. The dealer said that this weight of oil was better than theit 75-140w. It will dissipate the heat better. I have a 2002, 3500, 4x4, auto.

 

[ToolManTimTaylor]

Not to Hyjack but as for the guy who OCCAISIONALY tows (anywhere from 2K to 7K) But hotrods around like a fool ?? And I still to this day am leery of synthetic. C'mon guys push me off the fence please so I can sleep.

 

[Turbo Thom]

Tim:

The oil thing is like buying off a Snap On truck, Mac truck or Cornwell for tools. Some tools seem to fit your hand better than others. For some reason I bought Mac tools but SnapOn sockets. I think your preference of oil is the same thing. I've run the Amsoil for 4 years and with the analysis and what I've seen in the engine, I'll stick with it. The Series 2000 gear oil is blue. After 25K miles towing and seeing the temps go up , checking the level showed the color still to be blue. No wear metals. Still I change it every year. My engine oil, I change it every year also. About 50K miles per year. Now that is with the dual by-pass filter.



And the main thing I've found is that synthetic oil does not break down. It just gets dirty. Filter it, keep it clean and your OK.



. . Preston. .