I've been using Mobile 1 just recently used royal purple so I'm think of changing literally every fluid in the car and using royal purple that's what everyone recommends
I'd like to know if anyone felt any difference when they changed their Diff. fluid with Royal Purple 75w140? Also do I need to use any type of additive also?
It all comes down to personal preference. I prefer to run Amsoil 0w-30. Since you have higher miles I would suggest running either a 0w-30 or 5w-30 regardless what brand it is.