I have a technical question that I'm sure someone knows the answer to.

I have just purchased a L405 with full MD service history, a one owner car that was cherished and pampered by its fastidious previous owner (who traded it in for a newer model), the car is a 2014 (64 September plate) with 90,000 miles on the clock. All services have been carried out annually (September), however I noticed that the brake fluid has never been changed according to the service history, the MD has agreed out of goodwill to change this for me.

The question I have is, Transmission and Differential fluids? Should these be changed? If so, how often?

Many thanks in anticipation.

Should be changed at 80,000 miles or 5 years

Many thanks for that, so for you DIY mechanics, has anybody tackled the replacement themselves?