These x35's are rewarding cars to drive, yes they can be temperamental, but you will enjoy the car, the only issues I had so far was water pump + thermostat and a starter replaced. I use my 335 daily, fuel I don't even worry about as you will be driving a turbo'd 6cyl. Be patient and get a well maintained one and for piece of mind if you don't want to worry about repairs, get a warranty with a top up plan. This excludes maintenance and servicing which will be paid by you.