Can anyone help me, I have tried everything and not even the Dealer has given my the correct answer. My car is a 1992 E34 525i.

This one is kind of a long term problem. I have tried everything. First the dealer changed the radiator, thermostat, water pump, heater core and several more trips to check the problem. They have done compression tests and everything. This is over a 1 year period.

It doesn't overheat and every time I ask them to check the head gasket they come back telling me it is not the problem. I went to another mechanic, since now I no longer trust the Dealer, and he said it could be a small leak in the head gasket and one that is not noticable by tests. No signs of oil or coolant in either side. Just the coolant level will not hold for more than two days now. Before, I was only adding coolant every month, which I thought was due to the age of the car and possible leaks in other parts of the system. Now it is getting worse and nobody can figure it out.

The funny thing is, it runs like a champion. Any opinions. Any help. I would like to try the CarGo Seal Up but not sure if it is sold in Japan where I live.

Thanks for any help.