I heard this several times when I was looking for service history in the past, but the only dealer that would be able to give you a complete service history where the car has been serviced regardless of dealership location, is the original dealership which sold the car in the first place. Other dealers for some reason could only pull info, if it was serviced at their dealership and only what was done at that particular location. I'd call BMW and ask which dealership it was purchased from new and I'd call them for complete service history. Depending on the dealership they might or might not release that info. Good Luck!