Moin Moin, we carried out an oil change (10W40) with our Mazda 323F BA about 3 weeks ago including oil filter + spark plugs for our holiday in Rostock!Since when the engine is cold, it smokes with white smoke from the exhaust!Before the oil change, there was nothing at all.Now it leaves a large white smoke cloud while driving.After about 1min the smoke has gone away and there is NO white smoke more out.As said before the oil change, the not so much white smoke. We first thought the condensation water in the exhaust was… but that would have to be slowly evaporated after 1000km!!! There is no oil to be seen in the cooling water and there is no drop of water hanging on the cleaning rod.I think the ZKD could not be.Oil loss and cooling water loss is also not!I also took quite a lot of motor oil.Zündkerzen we got from BERU in the car shop for our Mazda!!!!Habe ma l made an engine wash before the holiday and also kept the “lance” in the end pot!Can it be connected with it?But then it should be evaporated soon!If the engine is warm and we can start the engine again after 10min nothing to see!It smells at the cold start from time to time after oil from the exhaust!!!The Mazda has run 201 000km and is a gasoline… ….Who can help us?Workshop said if no oil loss+cooling water will be less it can not be the ZKD!!! only after the oil change + engine wash!!!! Ask for help!!!! Dear greetings Björn&Yvonne from Husum