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			On my '01 (5600 miles) I get a blue puff on start every once in a while, but fairly infrequently.  It seems quite random, actually - I haven't noticed any pattern like first thing in the morning, parked on a hill, warm start, etc. 
 
Some smoke on start up seems normal - it is reportedly a result of the Boxster's engine design.  So long as you only see it on starting then you're likely OK.  Unless you're seeing a significant change in oil level, I'd not worry. 
 
Porsche specifically mentions that some oil consumption is normal in the owner's manual (on page 134 in my 2001 version) - likely as a result of the same concern you're probably feeling.  They mention several variables that can affect oil consumption, including quality of the oil, viscosity, climate, etc.
		 
		
		
		
		
		
		
		
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