This question is directed at people who have already replaced the differential gear oil. Is it okay to use the LSD additive along with a synthetic hypoid gear oil (i.e. Redline MT90, M1, NEO, etc.)? Or is this additive only used in conjunction with non-synthetic oils (b/c of accelerated brakedown of dino oil)? Yes, I have done a search. FWIW, I am an occasional autoxer. Current mileage is 4k miles. TIA.