Anyone on the board have any experience with the Mobil 1 75w90 LS rear gear oil? Specifically was a friction modifier needed on top of the additive already present in it? I'm looking to change out the fluid in my Camaro SS rear end but want to know if I need the modifier as well.
I've seen some other posts about it and it seems like it's a car by car basis. Some people needed it. Some didn't. But these were older threads.
Any info would be helpful.
If this is a pre-owned vehicle or one with more than run-in mileage, it would be on a car-by-car basis.
Refill the vehicle's diffy with the Mobil 1 LS fluid and then listen closely for any chattering on Figure 8 turns.
If no chattering, no extra FM needed.
If chattering occurs, add only 1 ounce of FM additive at a time
until the chattering disappears.
Most people tend to over treat their diffys using FM additives.