2014 RAM Express, 3.6/8speed auto,3.55 gears. It was 22° at 3:30 P.M., the EVIC starts the engine oil temp out at 104°. It takes almost 7 miles until the oil temp gauge starts climbing, 105°, 106°, etc. My question, if the engine oil takes that long to heat up, how long, or does the rear gear oil get up to temp? I've got a thermo gun and shot it as soon as I got to work. It showed 84° on the rear cover. Does the rear gear oil, in this cold, ever get up to normal temp??? Not enough miles? That 84° was after 25 miles @ 55MPH. Your thoughts please.