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White smoke on a diesel is either a blown seal in the cooling system or lack of heat when it is cold. If you are in a cold climate the glow plugs should come on and heat the cylinders before it starts. If this is not the case then antifreeze / coolant is leaking into the cylinders from the water jacket, this could be a cylinder sleeve or blown head gasket.
Water and vapor (steam) coming from the tail pipe is normal and will stop after a few miles when everything is hot. That is one of the reasons exhausts need replacing as they rot with rust and is more evident on cars that only do low mileage as the exhaust does not get hot enough to boil off the water and it sits in the pipe slowly rusting it away. What you see as smoke is probably steam and is more evident on cold mornings. If the car is not using oil then I wouldn't worry.
if its happening during non cold weather then you may have a head gasket going bad and need replacement.you can have a combustion chamber test and a co test done on the cooling system to see if anything shows.be aware that may not show a problem depending on how early on the gasket is in deterioration.have you had to add coolant to the system or have recently noticed the level going down in the overflow bottle or rad.this is another way of showing a possible head gasket problem.white smoke indicates the burning of coolant.
White smoke continuously blowing out from the tail pipe ? If it is only at the cold position it is normal, if it is always coming out it means oil consumed & compression is week. spark plug frequently needed ? If plug frequently shorted u need to overhaul or need to add oil treatment for increase viscosity.
Its perfectly normal.Hot exhaust gases mixing with cold air and by products of the combustion process create the watery substance that you see spit out .Dual fuel (LPG,Hydrogen etc) vehicles do this a lot more noticably.By products of the combustion process are various but water vapour is one of them.Alot of heat is generated by the exhaust so watching a car driving in very cold conditions you can see this effect more clearly