BMW 320d 2002 coolant leak... pls help !!

[CrissXL]

Hi, my name is cristian, and recently i buy an used 320d / 2002 / 150 HP..80.000 km

I have a suspect coolant leaking: almost every time, after 500km , i must put like 500 ml on my expansion tank
I chech everywhere from leaks.. but no visible leakings, or signs.I make two pressure tests (at cold, and warm ).. with no pressure loss.

In the cold mornings.. i have a white smoke.. coming from exhaust, ... smoke starts after 3 minute after i start the motor....keep 5 minutes, and after that, the white smoke is gone forever (until next morning).The white smoke apear only when wheater is cold, or is raining outside.

Does anybode have that problem, un a 320d .. or other bmw model ?
Please help !
Thx in advance.

<< sorry for my bad english>>

 

[320de46m47]

sounds like head gasket

 

[320de46m47]

With the engine cold, relieve any pressure in the cooling system by removing the radiator cap, re-install the cap tight and pinch the upper radiator hose tight with your fingers. Block the drive wheels, set the parking brake firmly, start the engine and put a load on it (do this with someone you trust will NOT run you over) by putting the trans in drive and raise the engine speed slightly with a foot FIRMLY on the brake. If the head gasket is blown more than just a "little", you will feel the radiator hose inflate as soon as the engine is loaded (cylinder pressure leaking into the cooling passages). If the gasket is leaking a lot, you may feel the hose begin to inflate as soon as the engine starts, or even while cranking.