Here is the thing about the dealer; they are always going to give like 70% of what your car is worth because that 30% is where they make money. The only I would trade in my car is if it was paid off because then it allows for a tax break when I purchase a new car. I'm t considering selling my 13' 535xi M-Sport as well and I got offered $21k when I know I get $29k for it private (
https://seattle.craigslist.org/tac/c...239162088.html). I'd recommend selling your car private.