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White smoke at startup (when the engine and exhaust have completely cooled down) is usually caused by condensation. It's especially noticeable in cooler weather when the car is used for short trips. The engine never really gets totally warmed up, existing condensation in the exhaust isn't completely evaporated. In short, what you may be seeing is simply steam vapor. If the smoke isn't white but is more gray or blue/white it's oil. A few seconds of oil smoke at startup is usually caused by leaking valve stem seals. Oil drips down the valves and onto piston tops when the engine is idle. On startup the oil is burned causing a few seconds of smoke. The puff of burning oil is most noticeable after the car has been sitting awhile, like overnight. Unless the seals are really bad not enough oil drips into the combustion chamber during shorter stops to notice any smoke. Cheers

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Q: Why does my 2003 4-cylinder Toyota Solara have white smoke coming from exhaust 5-10 seconds after startup regardless of temperature though less likely when cold does not smell like antifreeze?
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