Quote Originally Posted by jennija View Post
dont have a diesel yet looking for an older cummins though...
I'm not sure this is accurate. I had a buddy/coworker up in New Hampshire who setup a early 80's Mercedes to run on cooking oil and he ran it in the winter without issue. I believe he would run it on diesel until it warmed up then would flip a switch and it cut over to the cooking oil. Not sure if he was heating the fuel lines cooking oil tank or not.

While it's not quite as cold in NH as it is in MN, I'm sure it can still be done.