DDE-EA4711807010 Genuine Detroit Diesel® Oil Coolant Module For DD13, DD15

• Cascadia
• Coronado
• 122SD / 114SD

Western Star

• 5700XE
• 4900 series

1. Prevents oil overheating

Under heavy load (like hauling or highway driving), oil gets very hot.
The module removes excess heat using engine coolant.

2. Speeds up warm-up

When the engine is cold:

• Coolant warms up faster than oil
• The module transfers heat to the oil
  

3. Maintains proper lubrication

Stable oil temperature means:

• Better lubrication of engine parts
• Less wear on bearings, pistons, and turbo components

4. Improves engine durability

By keeping oil in its ideal range, it helps:

• Extend engine life
• Prevent internal damage

5. Supports emissions and efficiency

Modern engines (like those in Volvo Trucks and Freightliner) rely on precise temperatures for:

• Fuel efficiency
• Emissions control systems

1. Oil mixed with coolant

• Coolant looks milky / chocolate-colored
• Oily film in the radiator or overflow tank

2. Coolant mixed with oil

• Engine oil looks milky or foamy
• Oil level may rise unexpectedly

3. Engine overheating

• Oil isn’t being cooled properly
• Temperature gauge runs higher than normal

4. Oil temperature too high

• Especially under load (towing, highway, hills)

5. Low oil pressure

• Thinned-out or overheated oil loses pressure
• Warning light may come on

6. Poor engine performance

• Increased wear, rough operation over time

7. Oil or coolant leaks

• Around the oil cooler/module housing
• Drips under the truck