As per the other similar post today this will not be the piston rings, white smoke must be water getting into a combustion chamber.
Try googling 'white smoke' and 'mazda' as the engine's are the same, this might throw up more clues for you.
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2005 S40 T5 SE - Manual. Bilstein B4's. (For Sale)
2010 Citroen C4 1.6 HDi (bizarre Gearbox model).
2010 Renault Twingo (refreshingly simple)
2018 Infiniti Q30 1.6T Business Executive (what's this button do?)
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