What do you wish you knew when you bought your first BMW?

What is your question?

Hi - I just bought my first BMW. She is a 2004 325xi and seems to be in great shape. My mechanic is fixing a few little things but shared that he thinks it has been well maintained. - What do you know now that you wish you knew when you first bought your car? Anything at all. Driving tips, maintenance tips, advise on dealing with dealer, extra keys, places to learn information, etc. - What do you enjoy most about the car? - Any changes that you made to the car after a few years that you wish you had done earlier? - Anything else? Thanks Doug 2004 BMW 325xi Manual Transmission