3.0L Duramax Towing?

[BobHolthaus]

This was exactly our experience. On longer trips we now bring a few boxes of DEF just in case!

And I forgot to mention that I would top off your Def tank with every tank of fuel while towing. Or bring some boxes with you.

 

[Rangerdeepv]

And I forgot to mention that I would top off your Def tank with every tank of fuel while towing. Or bring some boxes with you.

Amen to this...........it drinks the DEF when towing a decent load like a sailor on leave in a foreign port.