I have a mini 2006 automatic with 95,000 miles Bought it a year ago with 85,000

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last 6-months started to burn through oil and car will start to sputter and then stall. usually at a stop light at a intersection. Put in 1/2 quart of premium oil and she will start back up again and go for another couple of weeks, and then do it again....... "WHATS THE PROBLEM AND WHERE SHOULD I BE LOOKING?????? HELP PLEASE......................