10/02/2026
Black, blue, or white. The color of the smoke coming out of a diesel tells you most of what's wrong before anyone touches a wrench. Black is fuel or not enough air, blue is oil, white is unburned fuel or coolant. Each one points somewhere different, and one of them means shut it down now.
https://www.truecountryservice.com/blog/95719-black-blue-or-white-what-diesel-smoke-is-telling-you
If it's the shut-it-down kind, call 660-280-3880 before you run it again.