DO NOT take delieverd of the car, nor return the loaner, until the paperwork has precisely what you want.

Dont arrive there at 6PM hoping for the best.... have them fax it to you in advance. You dont want them saying "oh the tech didnt get that to me, I'll get it to you ____". You want it ALL on the work order. A picture of your scanner or emails from the SA are not the same as the written repair orders and work orders.

I still believe the code your car threw (and that they should have read on arrival) are different than a fuel filter heater code....

IMO

PS 80%? That means BMWNA is covering at warranty rates- they wanted an extra 20% from you. Nice