If this is a low mileage later model car, it sounds like a real find. If it is a sportline, I assume that it is a '90 or newer, something like that. Reason I mention this is that the earlier M103 engine, this a smaller displacement version of the M103 engine found in the 300E, has valve seal problems that need upgrading if it has not already been done. You will want to ask questions about service records to see if this has been done, if it is an earlier car. Also ask questions about oil usage. All in all, the M103 is a great engine, and I agree that this would be one of the premier W201 cars if it is in good condition.