Nope. Many cars don't actually get the diff oil changed at all. You'll be OK. It's not from a back street dealer.Last recorded mileage, on its last service, was 4049 miles. I'm expecting a video presentation of the car on Wednesday afternoon, the day they will have the car on their premises, so we'll definitely know the final mileage then.
Should i be losing any sleep that they changed the diff oil at 4000 miles instead of 1800?
I really appreciate your input guys