Yes i did think that could be the cause, cosidering the bad weather recently and the age of the car, these things do perish! Yes i will post the problem on here when i identify it. Thanks again.
Lo` folks, newbie here, hoping someone can help...! My 04 Z4 is using (losing)? coolant, no obvious leaks, but vapour from exhaust, although I`ve noticed that other Z`s lose vapour too. Have checked for sludge in expansion tank, none,hope it`s not a head gasket,,,! Running fine, no obvious faults, Thanks, Thompson.