Originally Posted by Stbentoak
Been down to -15F with it... never plugged it in and I do have the block heater and cord.... I "could" do it, but don't really want to mess with hooking and unhooking it when its that cold outside (or forgetting its plugged in). It has always started and this diesel warms up faster than any other I've owned. More concerned with frozen DEF.
I use a little power service in the winter fuel mix, but other than that have had no other cold weather problems....
Dont worry about frozen DEF. Most of our trucks use it and we never had an issue caused by frozen DEF. According to the Cummins product data, DEF will begin to crystalize and freeze at 12f. We see that regularly in the winter and it never has prevented them from starting The pickups and larger trucks all have heated DEF tanks and piping that start warming the system when the engine runs.
From my read of the Jeep diesel supplement and talking to our shop mechanic, the GCED is similarly equipped.