I have a 2022 4Runner and Deciding which diff fluid to use. I was about to purchase the severe gear in 75w90 but then saw they offer a long life synthetic diff fluid. does anyone have experience with the long life synthetic diff fluid? Since my 4Runner has an open diff in the rear I would prefer to use a diff fluid that doesn’t have a friction modifier already added. The amsoil long life synthetic fluid doesn’t seem to have a friction modifier in it so Im now considering that. Am I being too picky trying to find a diff fluid without friction modifiers in it? Seems like everything sold now days has a friction modifier in it. I know you can use friction modifiers in an open diff but I have read some threads that mention some drawbacks of quicker oxidation.