ISX 15 max safe RPM

[Yauchout]

for whats its worth mine has been pushed in the high rpms alot and the jake brake seems to work best at 1900-2100 rpm bought my truck new and had to inframe at 687K but that was due to broken piston rings on #5&6 due to carbon packing. I didnt see any excessive bearing wear and the truck still idled at 30 psi of oil pressure. im not telling you to run it that way just stating my experience