There was another post like this before Christmas. I genuinely believe that it is a symptom of the cold weather and will rectify itself in Spring.
My 2005 190 leaked into the V last winter. The o-rings were less than a year old. Instead of changing them, I kept topping up, maybe 50-100ml every week or two as I couldn't be bothered to strip the 'stat out again. By May, the leak had stopped, and all was well for months. Then in November, shortly after we'd had the first frost of the season a small top up was required again. Since then I've topped up 3 or 4 times, around 50-100ml each time.
I'll wait until Spring, and see if it stops leaking again and let you know.
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