So a couple weeks ago, the rig was up on a friend's lift and we noticed the rear diff was weeping a little oil out the top plug.
Today I decided to replace the crush washer and while I was at it, called the dealer to check to see what oil they'd recommend to top things off (just checkin').
When I asked if I should use dino or synthetic, the parts or service manager said, "Definitely dino - don't mix the existing dino with synthetic - and get a 75 to 90 GL-5 oil."
No surprise since that's what is recommended, but wondered why they'd be adamant about not mixing the two??
Also, since it was last changed at the dealer w/ dino, at that time they seemed to discourage use of synthetic oil for both diffs and the t-case. Next service interval I want to change over to synthetic, but in both instances (last service and again today) their comments made me wonder why they'd discourage it.
Anyone know of any issues running synthetic in both diffs and the t-case? Either full on or mixed?
Today I decided to replace the crush washer and while I was at it, called the dealer to check to see what oil they'd recommend to top things off (just checkin').
When I asked if I should use dino or synthetic, the parts or service manager said, "Definitely dino - don't mix the existing dino with synthetic - and get a 75 to 90 GL-5 oil."
No surprise since that's what is recommended, but wondered why they'd be adamant about not mixing the two??
Also, since it was last changed at the dealer w/ dino, at that time they seemed to discourage use of synthetic oil for both diffs and the t-case. Next service interval I want to change over to synthetic, but in both instances (last service and again today) their comments made me wonder why they'd discourage it.
Anyone know of any issues running synthetic in both diffs and the t-case? Either full on or mixed?