Just put in royal purple 85w140, calls 75w140

[radster]

I realized my mistake at home but went for diff change anyway's. Vehicle is jeep crd figure it pounds rear axle 300lbs torque. Should I consider maybe just dumping a quart of 85w and put 75w90 quart in. Kind of mix thickness or bad idea?

 

[c3po]

I don't think it is a big deal, you should be fine.

 

[Johnny]

Leave it in until it is time to change again.

 

[shpankey]

Your fine. Especially in this heat wave now. lol

 

[Jim Allen]

Does RP even make an 85W140? Or did the OP mix up his viscosities?

 

[Johnny]

Yes they do.

http://www.royalpurple.com/gear-oil-pp.html

 

[Rob_Roy]

Yes they do...or at least they did. I am looking at a bottle of RP 85w140 sitting on my shop bench. I would run it until it is due to be changed.

 

[Johnny]

Major difference in the pour point but other than that they are close.




http://www.royalpurple.com/prod-pdfs/max-gear-ps.pdf

 

[radster]

Will gas mileage tank now? I would be willing to swap out a quart and put another quart back in. 75w90 mixed with 85w140? Both royal purple, I had a dikkens of time pumping that fluid back in its thick stuff. Would this give me 80w115?

 

[Rob_Roy]

I have run 75w140, 80w140, and 85w140 in our Navigator with no observable changes in fuel economy. I doubt you will notice any difference unless you are driving a lot of short trips in cold weather. Why not run the 85w140 for 4-5 tanks of fuel and see how it does?

 

[unDummy]

Gas mileage won't be affect with the CRD. Diesel mileage.....

Most 'ends need all the help they can get. The 85w140 will do fine. And, after 30k miles, change it to a 75w140.

RP also will shear some.

How cold is a Utah winter?