Ive been searching for gear oil stuff for a while now, and I think I will be going with Royal Purple.
Now I need to decide which weight to go with. This is for my 2000 Grand Cherokee with Dana 30 (front) and Dana 35 (rear) with 3.55 gearing. I have the Selec-trac 4wd system and the 4.0 engine if that matters.
The manual calls for 75w90 or 75w140. I dont tow anything and rarely carry heavy loads. Our average temps range from 0F to 100F. Will there really be a difference in cold performance since both are a 75Wxx? What about fuel mileage, is there a noticable difference between the two?
Thanks!
Now I need to decide which weight to go with. This is for my 2000 Grand Cherokee with Dana 30 (front) and Dana 35 (rear) with 3.55 gearing. I have the Selec-trac 4wd system and the 4.0 engine if that matters.
The manual calls for 75w90 or 75w140. I dont tow anything and rarely carry heavy loads. Our average temps range from 0F to 100F. Will there really be a difference in cold performance since both are a 75Wxx? What about fuel mileage, is there a noticable difference between the two?
Thanks!