Rotella T6 only comes in one weight and is full synthetic 5w40

 

Very simple. It is what the manual says to use for the ambient temperature I am operating my Jeep in. There are Jeeps that last hundreds of thousands of miles using the recommended oil.

 

I'd be willing to bet if that 13 year old manual was re-written today, it would recommend 5WXX or even 0WXX, but maybe not.

 

But yeah, use whatever viscosity is recommended for your region and driving habit. I use 5w30 conventional in all my vehicles. I have this conversation at least once a day with customers, not doing it long hand and I'm sure I'd just be repeating what these fine folks have already said.

 

I would believe 5w20 or 5w30 but I doubt it would be any 0w oils. Manufacturers seem to have a hard time telling people to run a synthetic oil.

 

I run Amsoil AMO (10w-40 with added zddp). If it gets cold enough, go for a 5w or 0w. Otherwise grab what you want. Of what is mostly available locally to most places. Pennzoil Platinum/Ultra full syn, Castrol Edge, Valvoline Synpower.
Interesingly enough, when I run 40 weight my heep doesn't leak as much. I know my RMS leaks, and now so does my OFA. will fix those soon.

 

Mobile 1 synthetic 10w 30.Good stuff

 

Why not run T6 which has ZDDP in it, 19 bux a gallon.

 

Mobil 1 oil is thinner than what it says on the bottle

 

Are you a company Rep or what?

 

Nope lol.

 

I use Castrol GTX High Mileage in 10w30. It works fine for me.

 

If you like 5w30, use it. If it's 10w40, use it. If it's full synthetic use it!

I use whatever I feel like buying at that particular time...so far it has worked for the past 25 years... :0

 

Ok just checkin, must be a true believer than.

 

thanks for info. i think it is good idea to buy oil in big volume. it is cheaper. we have several diesel vans and trucks so i can use same oil.