It was an E92, and specifically the 2008 model. The most expensive thing I ever did was the brakes. The competition package has floating discs and they were ~$2500 to replace. There are just a lot of design decisions on a car like that which favour performance over maintainability. Another example from when I first got it was the car was the gas tank would only fill up to about 3/4. Turns out because the car is so low the tank has a saddlebag design and a transfer pump transfers gas between the two sides of the tank. Though the truth is even oil is a lot more expensive as it drank six quarts of 10W60.

A newer car would have likely been a little easier on maintenance, but the truth is the thing begs to be driven hard, which also doesn't help. Haha