I have a mazda 626, 2.0,16v 96/97.
When I start up in the morning when the engine is cold,I get blue/white smoke coming from the exhaust for approx 10-15 seconds, then it's ok, It doesn't seem to be burning oil and there is no loss of power.
I have replaced the valve stem seals and head gasket, The injectors have been changed and the spark plugs replaced and an Oil and filter change.
I have now run out of idea's, so if anyone has had a similar problem or knows what the problem is, I would appreciate any help or advice anyone may have.

I asked someone about that today as I have an earlier year Mazda that frankly looks as if a smoke bomb goes off when I start my car up some times. he said that if the smoke is white then it probably is antifreeze leaking into the head caused by the alum. head being a bit eaten away or even warped.
So this may be what is causeing your smike. I always thought this type of smoke was caused by oil seeping and burning out the exhaust.
Does your gauge read cooler than usual? He said that the temp indicator/guage may read cooler as the sensor is not submerged in the fluid giving you a false reading on the gauge......the sensor will read the cooler vapor or steam if it is not submerged...which he said supports the head problem Makes sense but it's still news to me.
With mine I found one of my cylinders is not working well so I will be putting another engine in with 56K miles...beats mine at 173K. Spending $1,400 for engine w/ 6 month warranty and labor sure beats spending over $27,000 for a new car and more in insurance premiums. Plus this Mazda is one of the best cars I've had.

If it's blue it's oil. The only thing left if your car doesn't have a turbo is piston rings. You can try a heavier oil. Like if your using 5W-30 go to 10W-40 and see if the smoke lessons or stop.

Hello Karen.
Have you fixed the problem. If yes what was the problem ?

Regards

Ziggy