1999 (6/98) F250 XLT 4x4, 7.3L, DP Tuner 80hp Etune, HX Crossover, ~365K miles
360k plus miles….99% of the time it’s been Rotella 15w-40. Filters have varied, Fram, NAPA gold or Motorcraft. With this early production ‘99 coming up on 23 years old, see no reason for change. Inexpensive motor insurance (knocking on wood)!