At least Iīve seen some 5series kombi, never a 3series kombi with Europcar. But I think it depends on the station. I rent at +/- small stations and maybe they have less different types there.

Just brought my car to the station and will have one the next weekend, too. Will do it again with swmr and will see what comes out.
That guy told me that I could keep my c-class, he doesnīt want to have a car like that ^ No way..

Yes, Europcar first with 20 rentals but doesnīt bring too much to me. Yes the upgrade but I saw that they donīt give you such nice upgrades as sixt. At sixt you often get a 5series instead of a golf (if senator or other card) but thatīs more than just one simple upgrade. Europcar would give you a Nissan something which is one group higher, they keep it as small as possible instead of that you have to "force" them with the car-group at least if you donīt know them.
Just talked to Europcar guy and he told me that they are going to change their behaviour and try to act more like sixt with giving more easily good upgrades.

Another thing with the First Card is the Priority Pass, they only reason why this card makes sense for me. But with a C-class ticket or other status you get in a lounge anyway.

Why are you looking for a smaller station?