Some clarification on the size of the hex key required for the oil change drain plug on the 2015 diesel. It is 12mm, not the 13mm reported in earlier posts. !3mm might be easier as it is the same as a 1/2"(.011" smaller). Seems trying it for size was the only way to find the size since the dealer didn't know and none of the guys could remember! FCA Canada was of no help.