Where is rear differential fluid at and when need to chang it on Chrysler 300s 2019 3.6l

 

Its listed in the users guide . I believe is 75W85 but you probably could use 75W90 and be fine . Should hold only 16 ounces . Just drain and refill , pretty straight forward .

 

Doesn't hurt, but honestly, next to no one ever changes rear diff fluid unless they are doing a repair. I've had ... I have no idea how many vehicles and have never done so except on one used van that had a diff issue that needed repair.