Differential oil for towing

Any opinions regarding this? I was in the dealership yesterday getting crush washers for everything and noticed that the Toyota branded oil they had was 75-140 I believe. Manual calls for 75-85. I tow a cargo trailer once a month and was going to get Redlines 75-90. Would the 75-140 be preferable for towing? Or just use Mobil 1 and save some bucks?

 

go full synthetic anything and you should be good. also stick with the weight or close to it that the manual recomends

 

A 75w90 is good...I have used Amsoil severe gear in a 2003 and I am currently using Mobil 1 in my 2012 and they both towed smooth as butter. I prefer Amsoil cause I feel it can handle the higher temps a little better (Only my opinion I have no way of proving it, based solely on driving "feel"). However Amsoil is expensive to say the least so in the end I would use either with confidence. Sorry OP I never used Redline... As far as the 75w140 is concerned I am under the impression unless your are towing everyday or doing real offroading there is no reason to use it. And I also heard you get a slight drop in MPG. But again someone with more experience may want to chime in about the 75w140... With towing I found to be as gentle on the truck as the driving conditions will allow you to be and that with out weight and surpass any choice of "fluids" in addition to following the manufacturers recommendations.

 

Yep. In the proper weight specified.

 

I guess I will go with Mobil 1 in the differentials and Transfer case and Redline MT-90 in the transmission.