I have a 2001 318 Ci with a leaky head gasket , since im about to fix it what other parts should I change seeing the motor is gonna be open? its a pretty high mileage car with poor maintenance from what i can tell. It just clocked over 250.000k kms. So far I've done the water pump and the oil filter housing gasket on it. Any suggestions for what to look for and change when doing the head gasket? Im fairly new at this, so be patient with me hehe..