White smoke on start up Mazda 6?

white smoke generally isnt anything to worry about as such, however, i would check the water levels in your car regularly as this could possibly be a cause, but more often than not its just water vapour that has accummilated in the system from burning of the fuel, remember that the fuel is made up of mainly water so thats why our exhausts rot eventually.

if you check your water levels and also the oil filler cap and you see that it has a creamy white/yellow gue around the top then its likely that your cylinder head is on its way out.
 
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