This is probably oil burning off which has seeped by the valves and rings overnight. Sign of a higher-mileage engine. An oil additive for high-mileage engines may help.
Otherwise, it's not a serious problem, just fair wear and tear.
Charlie
Usual cause for this is worn valve seals. Check the movement of valves in valve guide and replce valve seals this should stop the blue smoke on start up.
Miles???blue??? white???black???? if the car runs ok and its blue, the valve seals in the engine MAY be leaking. If it was me I would just keep an eye on the oil level, it should be checked at each fuel fill up. if it is the valve seals, I would let it go, unless it gets worse. Oil is cheap compared to replacing the seals.
If it's only on startup it will be the seals. This usually happens when in a warmer climate like sunny arizona, or if your car has really high mileage. A stuck valve you'd be able to hear the car run rough. A broken ring would smoke all the time, not just at startup. If your car is running smoothly, and it's blue smoke only on startup, then it's the valve sears. They don't cost much, but the procedure to replace them is very involved.
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You either have a stuck valve or a Ring that is going bad. If yo do your own oil changes try running GUNK Sludge cleaner in the motor then change the oil. Your second option is to do a compression check on all Cylinders. Your looking for the cyclinder with low compression. Everything seems to check out will need to have a tech check out the engine.
SOURCE: blue smoke
if its a petrol motor the valve guide seals are gone or if its diesel the glow plugs arn't working properly and may need looking at.
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