I'm also Sixt Plat and the airport was cologne - last weekend happened something unbelievable. Rented CLMR and got a BMW 335d Coupe - whatever class this is (LDAR probably). But I rented only for one day, maybe thats the reason. Usually I rent Mo-Fr. or Fr-Mo and this kind of Upgrade never happened before.

I really want to know from some Sixt Diamond Card holders what kind of Upgrades they get. Maybe we should open a thread with this subject ?!?!