Trouble seems to follow us...

DutchmenSport wrote:
Thanks for the information. My new truck has a little over 3000 miles on it. I've had to add DEF. Took it to a GM dealer (we were on vacation towing the trailer too). They were nice, got us filled up again. They said when we purchased the truck, the DEF was probably not full, it should go much longer between fill-ups than that.

Anyway, I now carry 2 gallons of DEF all the time. No problem for space with that shell I have on the truck. I have free oil changes and servicing on the truck for a long time. So hopefully, the GM guys will know when and how to service the DEF and the filters and everything on regular intervals. I most definitely will ask them about this the first time I take it in for an oil change. Got the truck in April this year, and really use it only to tow my camper and my utility trailer. So everything about this truck is still new to me. I'll take any tips and warnings anyone can throw at me.

Thanks for the tip!

take note that DEF is temperature sensitive and has a shorter shelf life in heat. (Yeh, I just found that out too!)..

Q. What is the shelf life of DEF?
A. The shelf life of DEF is a function of ambient storage temperature. DEF will degrade over time depending on temperature and exposure to sun light. Expectations for shelf life as defined by ISO Spec22241-3 are the minimum expectations for shelf life when stored at constant temperatures. If stored between 10 and 90 deg F, shelf life will easily be one year. If the maximum temperature does not exceed approximately 75 deg F for an extended period of time, the shelf life will be two years.

my truck bed temps are over 100, I don't have a cap.
the daytime temp here in Austin has been over 100 some 20+ days now.