83 Gmc
I have an 83 GMC 2WD 6. 2L D with 250000 miles on it. Bought it used with about 40000 miles on it. Have NEVER TOUCHED the engine except for changing oil (Rotella 15/40) approx every 5000 miles. I have replaced 3 fuel pumps though.
That being said ... I basically agree with the other...