"person 1: "my 7.3 idi has over 400,00 miles on 'er and still runs strong as ever
one of navistar's best diesel engines ever made, commonly found in international heavy duty trucks & ford light duty trucks
""person 1: "my 7.3 idi has over 400,00 miles on 'er and still runs strong as ever" What is the definition of "7.3 idi"?