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Congrats!

Not a bad first BMW!

Cali prices seem to be higher than usual always. For all that work I dont think its too bad. Careful with the tints as mentioned above.
Ceramic coating makes washing the car EXTREMELY EASY. So easy, the car also stays clean longer and overall looks better. I have it on my car and it is one of my best money spent items.

Dont abuse the car early on, even if its a lease. Get a few thousand miles in the car before you start doing launches and stuff like that.

I have sensatec, super easy to treat and clean. I use regular leather products and a conditioner. Keeps them looking rich and they smell great. Very comfortable seats.
Same goes for the steering Wheel, every couple of months at least give it a good clean and conditioner.

I have winter wheels on right now but I am going to ceramic coat the summer set, as they are all black dust will show right away.

I use a lot of the AMMO products, if you wash the car yourself itll help to have good products. They are worth the money and last a long time.