To determine if an overfilled crankcase is causing excessive oil consumption, perform the following:
1. Ensure vehicle is parked on level ground.
2. Perform a universal dipstick calibration check; refer to SIB 12-60-94R (May 1995).
1. If the calibration check indicates that the oil level is off by more than 2 mm (0.078 in.), contact your Detroit Diesel regional support office.
2. Check for oil leaks;