Well it takes a while for it to warm up temp wise. I see your in NY and I am also so it does take 15mins just for the needle to budge to 150 degrees in the cold weather. I usually let it idle for 15 mins then drive, not pushing the car until temps are at least 180. After running Mobil 1 temps run 10-15 degrees less. No need for you to take to dealer, perfectly normal.
__________________
|2013 Audi S4|Ibis White/Black|S-Tronic P+|
|2013 370z|PearlWhite/Persimmon|Touring/Sport/Nav|F.I. CBE 18" CF|
|Sold|2011 370z|Gun Metallic|Touring/Sport/Nav|
|