One problem related to crankcase (pcv) has been reported for the 2003 BMW 325. The most recently reported issues are listed below.
The contact owns a 2003 BMW 325xi. While driving at approximately 50 mph, smoke appeared under the hood of the vehicle and filled the driver's cabin. The contact exited the vehicle and observed oil between the valve gasket and the head gasket as well as oil leaking underneath the vehicle. The vehicle was turned off. When the oil dip stick was removed, hot oil shot out onto the contact. The contact was burned, but did not receive medical attention. The vehicle was towed to an independent mechanic where it was diagnosed that the pcv system failed and needed to be replaced. The vehicle was repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 100,000.