Diamondsea
New member
I have 4700 miles on the rig. A couple of days ago I drove down a very steep private drive and upon startup to leave a check DEF message came on. From my readings on this forum I thought that was premature mileage wise. I decided that the sensor in the DEF tank might have been left "exposed" above the fluid level due to the extreme grade. Anyway at my next fuel stop at a typical 7-eleven type gas station that sold diesel fuel I asked if they sold DEF. Sure enough I was surprised that they did near the motor oil and it was just over $6/gallon. It was branded "PEAK" which is a name I am familiar with for products like washer fluid. It was labeled "Blue DEF" although it was clear, not dyed. The gallon jug had no special spout or opening but I was able to pour it in carefully without spilling a drop. Upon startup I continued to get the check message, but the message did not appear after the next startup and it has not returned.
I guess I will never know if the level was really down or if the very steep grade had fooled the tank sensor. My driving is mostly highways with little stop and go city type driving. I was thus surprised to add the fluid at 4700 miles so I tend to believe that the steep grade fooled the system. Does very cold weather use more DEF?
I guess I will never know if the level was really down or if the very steep grade had fooled the tank sensor. My driving is mostly highways with little stop and go city type driving. I was thus surprised to add the fluid at 4700 miles so I tend to believe that the steep grade fooled the system. Does very cold weather use more DEF?