All right next month I am going to buy a BMW Z4 the things that scare me are 1) how much does the oil change cost? 2) how often do I need to do its services and how much do they cost? ANYONE know about the MECHANICAL problems that this car might give me? appreciated

I am 19, and have owned two BMW's. I have payed for them both (currently paying off the second), and I absolutely love them!
I am paying for rent, tuition, food, fuel, car payments, and car maintenance. They are not too bad in terms of price, and the reliabiltiy is great if you take care of them. You don't need a BMW dealer to change the oil, any shop is capable of doing the work, so why pay the dealer an extra $40? If you are this concerned, talk to the dealer, and ask them about prices.

HONESTLY, stay away from BMW. You will be spending a ton of money on service and repairs. They are NOT reliable, you will have alot of EXPENSIVE problems.

An oil change is an oil change, unless you spec. synthetic oil, which ups the cost of the oil 3x, there is no price difference.

Once again, you will be in the shop with it MORE OFTEN than AVERAGE, and the PARTS cost ALOT more than average. Also, alot of simple jobs on BMWs take more time to do because of the way the engine compartment and top of the engine is designed, so you will be paying ALOT more for hourly labor (my shop charges $80 per hour labor)

You want a roadster type of car like that... I would recommend a Pontiac Solstice, Saturn Sky, or Mazda Miata.