Ok on cold start(my last 2) with temps 30-35 she sputters and bogs down quite a bit. I know about the grid heater and the volt meter did show lots of movement but should the grid heaters cause the engine to bog down?It was enough for the wife to ask me why it was doing it. Also picked up some oil(valvoline premium blue). I know things are changing with the ULSD but the container had all API services listed. CJ-4 all the way through CH-4 and then under that says its CI-4 Plus. I know that I should be using CI-4 so is this oil the new stuff rated for ULSD that is supposed to have less soot control and all that or is this good oil to use in my CTD?Its and 06 with 1900 miles.