A nickname for a diesel-powered vehicle, particularly an older heavy-duty truck or passenger car. The term originates from the fact that diesel fuel is essentially a light grade of oil, and early diesel engines were notorious for consuming crankcase oil alongside their fuel. Mechanics and enthusiasts use it to distinguish diesels from gasoline-powered vehicles.
Heard on the job
Bring that old oil burner into the third bay so we can test the glow plugs.
Insider tip
While originally referring to the heavy soot and actual engine oil consumption of early diesels, the name remains popular for any diesel vehicle regardless of its emissions.