From what ive seen & read on this forum over the last 12 months,id say that these cars dont seem to sell very fast if the service history is anything less than spot on,speaking personly I wasnt prepared to buy one that I knew would be harder to sell when the time comes because of this fact,running in sevice on time is a must have,also imo the car should not have gone more than 24 months without a service,as specified by bmw,personly I dont let cars like this ive owned go more than 18 months without a service,regardless of mileage,I only do 3000 ish a year.
Some very helpful & knowledgeable guys on here,so id listen to the advice,could save you alot of grief,they've certainly helped me no end,.