What's the best synthetic oil? How do I determine with size diff I have, I believe it's a 9.25, also, how do I determine if I have limited slip.

Thanks

 

Any name brand full synthetic should be just fine. Ive been running Valvoline 75w140 full synthetic. My manual say for 75w90 but i tow a lot and drive it hard as hell so i like the 75w140 more. in your glove box there should be a sticker that says what gears you have and if you have an anti stin or open.