2015 Freightliner M2 106 Oil Capacity & Filter

The 2015 Freightliner M2 106 with the Cummins ISB 6.7L engine takes 19 quarts (18 liters) of 15W-40 CK-4 diesel engine oil.

Quick answer

• Oil Capacity: 19 quarts (18 liters)
• Recommended Oil Weight: 15W-40
• Oil Spec: API CK-4 (or CJ-4 for older models, but CK-4 is current and backward compatible)
• OEM Oil Filter: Cummins 4367100
• Aftermarket Oil Filter Cross-References:
  • Fram: CH11802
  • Wix: 57077
  • Mobil 1: MO11802

Capacity by engine option

The 2015 Freightliner M2 106 was primarily equipped with the Cummins ISB 6.7L diesel engine. Therefore, the oil capacity remains consistent across most models.

Oil change interval

Maintaining the proper oil change interval is crucial for the longevity of your Cummins ISB 6.7L engine. Freightliner and Cummins recommend the following:

• Normal Duty: Every 15,000 miles or 500 hours, or annually, whichever comes first.
• Severe Duty: Every 7,500 miles or 250 hours, or every 6 months, whichever comes first.

"Severe duty" conditions include frequent short trips, extensive idling, operation in dusty environments, or sustained heavy loads.

Drain plug torque

The oil pan drain plug for the Cummins ISB 6.7L engine in your 2015 Freightliner M2 106 should be torqued to 59 ft-lbs (80 Nm). Always use a new crush washer to ensure a proper seal and prevent leaks. The crush washer is typically integrated with the drain plug or sold separately.

How to change the oil

1. Warm-up Engine: Drive the truck for a few minutes to bring the oil to operating temperature, ensuring better drainage.
2. Park Safely: Park on a level surface, engage the parking brake, and chock the wheels. Allow the engine to cool slightly to avoid burns.
3. Locate Drain Plug: Place a suitable drain pan under the oil pan. The drain plug is typically on the bottom of the oil pan.
4. Drain Oil: Carefully remove the drain plug and allow all the old oil to drain completely. Inspect the old oil for any signs of contamination.
5. Replace Drain Plug: Install a new crush washer on the drain plug and reinstall it, tightening to 59 ft-lbs (80 Nm).
6. Locate Oil Filter: The oil filter for the Cummins ISB 6.7L is usually on the side of the engine.
7. Remove Old Filter: Use an oil filter wrench to remove the old oil filter. Be prepared for some oil spillage.
8. Prepare New Filter: Apply a thin coat of new oil to the gasket of the new Cummins 4367100 (or equivalent) oil filter.
9. Install New Filter: Thread the new filter on by hand until the gasket makes contact with the mounting surface, then turn an additional 3/4 to 1 full turn. Do not overtighten.
10. Add New Oil: Remove the oil fill cap and add 19 quarts (18 liters) of fresh 15W-40 CK-4 diesel engine oil.
11. Check Oil Level: Start the engine and let it run for a few minutes to circulate the new oil. Shut off the engine, wait 5-10 minutes, and then check the oil level with the dipstick. Top off if necessary.
12. Inspect for Leaks: Check around the drain plug and oil filter for any leaks.
13. Dispose of Old Oil: Properly dispose of the used oil at an approved recycling center.

Common issues / tips

• DPF Regeneration: The Cummins ISB 6.7L in the M2 106 utilizes a Diesel Particulate Filter (DPF). Using the correct CK-4 oil is vital for DPF health, as it's formulated to minimize ash content, which can clog the DPF. Never use oils not designed for DPF-equipped engines.
• Fuel Dilution: In some diesel engines, severe duty cycles or frequent DPF regenerations can lead to fuel dilution in the oil. While your oil analysis may reveal this, consistent oil changes per the severe duty schedule can mitigate potential issues.
• Coolant Leaks: Keep an eye on your coolant level. Though less common with the ISB 6.7L than some other engines, internal coolant leaks can contaminate the oil. If your oil appears milky, it could indicate a coolant leak.
• Oil Analysis: For fleet operators or those running in severe conditions, regular oil analysis can provide valuable insights into engine health and help optimize oil change intervals. It can detect issues like fuel dilution, coolant contamination, or excessive wear metals.
• Source Quality Parts: Always use high-quality filters and genuine or reputable aftermarket oil to protect your investment. The cost savings from cheaper alternatives rarely outweigh the potential damage to your engine.

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