At risk of being banned from the forum - I have used Mobil Fluid 424 or Rotella Tractor fluid for years, in 2 129's and an IH 2444. Hytran is a great product blended for Case by Viscosity Oil Co., but is very expensive. The only difference I see in comparing spec sheets is Hytran uses calcium sulphenate as an antiwear agent,others use zinc/ phosphorus. Have never had any wear problems, filter clogging, overheating or other issues using 424 or Rotella. Both 424 and Rotella are about $75- $80 for 5 gallons, if you shop around.