On start up, there is white/blue smoke, after that its fine. on 2006 Subaru B9 Tribeca

When I start my car it seems like it takes a while for the car to turn over (only a few seconds but longer than i am use to), then when it does turn over there is white/blue smoke that only last for about 10 or 15 seconds then after that it runs fine. I should also say that it only happends when the engine is cold. Not sure what to do, just bought it and wondering what i should do. PLEASE help me out!

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2 answers 3 comments
HOW MANY MILES ON IT. THE SMOKE COULD BE A SIGN OF A COUPLE OF THINGS. DOES IT USE ALOT OF WATER OR OIL?
Mine has 63000 and it does the same exact thing...i want an answer too. Thanks.
I have same problem 2006 b9 tribeca 64,000 miles
Mine does the same thing, did you guys figure out why?
I owned a toyota rav4 that did this ive also worked on a lot of cars. Its usually the valve stem seals. Just leave em. On a higher mileage car its not that big of a deal as long as its not fouling spark plugs.