The white smoke on startup is common especially after sitting for awhile. Although 3 minutes of white smoke is alot.
Randall says:
"The Puff of Smoke at Startup
This is normal, especially if the car’s been sitting for a few days. Oil accumulates around the piston rings due to the way the boxer (yes, I spelled that right) engine is designed. For this reason, it’s always good to keep an eye on your oil level." from his website :
http://www.iwantaporsche.net/BoxsterInfo.htm
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