Idle the engine a few minutes before routine shutdown. After full load operation, idle the engine three to five minutes before shutting it down. This idle period will allow the lubricating oil and coolant to carry excess heat away from the combustion chamber, bearings, internal components, and turbocharger. This is especially important for turbocharged, charge air-cooled engines. Refer to the following chart for proper engine shutdown:
| Driving Condition | Load | Turbocharger Temperature | Idle Time (min.) Before Engine Shutdown |
|---|---|---|---|
|
Stop and Go |
Empty |
Cool |
Less than One |
|
Stop and Go |
Medium |
- |
One |
|
Highway Speeds |
Medium |
Warm |
Two |
|
City Traffic |
Maximum GCWR |
- |
Three |
|
Highway Speeds |
Maximum GCWR |
- |
Four |
|
Uphill Grade |
Maximum GCWR |
Hot |
Five |