The dealerships don’t often have a lot of room to wiggle on CPO’s. The dealership covers the cost of repairs on CPO cars so they have to cover what they bought the car for plus the part and labor to fix anything that was damaged by the first owner. (Rims, door dings, paint correction) The cars with the most wiggle room are high option cars, dealerships may only make 2-3k on base options but they can make up to 10k on higher optioned cars. The most savings you’ll ever get at a dealership is a high optioned car at the end of the month. Sometimes you’ll get lucky, find a CPO car they didn’t put much into and they didn’t buy for too high a cost but generally given the market over the last year they could be covering losses from high buy back costs during the prime of car shortage.
As far as bmw is concerned 2 series (18-25) 3/4 series (25-35) 5/6 series (35-55) 7/8 series (55+)
That being said… Fuck a salesman’s thoughts, buy what you can afford that puts a smile on your face, test drive them, make sure the choice is right for you