Engine Oil Temperature Gauge
Optional instruments are not found on every vehicle. They are stand-alones, not driven by the instrument cluster, and are usually located on the auxiliary dash panel. They are listed here in alphabetical order, to make the information easier to find.
Notice: A sudden increase in oil temperature that is not caused by a load increase may indicate mechanical failure. Bring the vehicle to a safe stop and investigate the cause to prevent further damage. Do not operate the engine until the cause has been determined and corrected.
During normal operation, the optional engine oil temperature gauge should read in the following temperature range:
-
180 to 225°F (82 to 107°C) for Cummins ISB engines
-
177 to 203°F (81 to 95°C) for Mercedes-Benz MBE900 engines
Note: Under heavy loads, such as when climbing steep grades, temperatures that exceed the normal oil temperature range for a short period are not unusual. If the temperature returns to normal when the load decreases, there is no problem. See Fig..
