MAINTENANCE Maintenance Tables Table 6 Maintenance Intervals by Engine Hours 72 All information subject to change without notice. (Rev. 04/08) DDC-SVC-MAN-0040 0704 Copyright © 2008 DETROIT DIESEL CORPORATION Procedure Severe (hrs) Short- Haul/(School Bus) (hrs) Long-Haul (hrs) Engine Oil and Filter 350 500 or 6 months Fuel Filter 700 1000 Valve Lash Adjustment 1400 2500