White Smoke

#1
I have a Carolla 1.4vvti 2001. White comes from exhaust, after a minute from start up. Checked oil, all clear, but does burn oil over time. Coolant level is good, never overheats. Took car down motorway for 45 mins. Exhaust runs clean. However I start it up after 20/30 minutes it goes back to white smoke again. Car does 4500 miles a year and gets used on short runs three times a week. Any suggestions please
 
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