I Have a Mercedes stationwagon - too expensive to work on! Are Range Rovers, Volvos and Audis as expensive to work on?
Any luxury vehicle is going to cost big money to maintain. The parts are usually more expensive and if fixed at the dealer, labor rates are high. Out of the brands you listed, Volvo's might be a little more reliable, so if you do have to do some work on them, it isn't as often. Good Luck!
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