Question what pressure do you go by do you use the cars official tyre pressures from the door jam or do you use the tyre manufacturers recommendations

Reason I ask is bmw recommend to use 2.2 bar front 2.6 bar rear on the 18" setup

But having looked at vredestein and choosing my car and tyre they recommend 3.0 bar front 2.8 bar rear

Odd as rear pressures are usually higher on staggered wheel bmw setups

http://m.vredestein.com/car/search/model/result?make=bmw&model=5er-reihe%20(e39)&type=525%20i&version=31712