Hi most esteemed forummers,I'm intending to purchase an 520i E39 AB 2002. However, the owner doesn't have the service maintenance records. Is this a big risk? I wouldn't then be able to tell how much has been changed or what has / hasn't been done to the car. Overall, the car looked like it's maintained well but looks can be quite deceiving.I would like to know if it's a risky purchase or is there any other way to know the history of the car.Thanks everyone for your input!