2025 Freightliner Cascadia Oil Capacity & Filter Reference

Your 2025 Freightliner Cascadia requires between 40 and 48 quarts (37.8-45.4 L) of 10W-30 or 15W-40 heavy-duty diesel engine oil, depending on which Detroit Diesel engine your truck is equipped with.

Quick Answer

• Oil Capacity: 40-48 quarts / 37.8-45.4 Liters (with filter)
• Recommended Oil Weight: 10W-30 or 15W-40
• Oil Specification: API CK-4 / DFS 93K222
• Oil Filter (OEM): Detroit Diesel A4721800509
• Oil Filter (Aftermarket): Fram P10834, Wix 57890, Mobil 1 M1-702

Capacity by Engine Option

Oil Change Interval

For the 2025 Cascadia, oil change intervals depend heavily on duty cycle:

• Normal Duty: 60,000 miles / 1,000 hours. This assumes typical on-highway use with average load factors.
• Severe Duty: 45,000 miles / 750 hours. This includes frequent idling, heavy loads, mountainous terrain, or operation in dusty environments.

Always consult your owner's manual and onboard maintenance minder for the most precise interval for your specific operation.

Drain Plug Torque

• Torque: 37 lb-ft (50 Nm)

Note: It is highly recommended to replace the drain plug crush washer at every oil change to prevent leaks. Consult your dealer for the correct part number.

How to Change the Oil (Simplified)

1. Run the engine for 5-10 minutes to warm the oil.
2. Safely park on a level surface and chock the wheels.
3. Place a large (50+ quart) drain pan under the oil pan.
4. Remove the drain plug and allow the oil to drain completely.
5. Remove the oil filter. Ensure the old gasket comes off with it.
6. Wipe the filter housing mating surface clean.
7. Apply a thin layer of new oil to the new filter's gasket.
8. Install the new filter and hand-tighten, then turn an additional 3/4 to 1 full turn.
9. Reinstall the drain plug with a new crush washer and torque to 37 lb-ft.
10. Fill the engine with the correct amount and viscosity of oil.
11. Start the engine and let it run for a minute, checking for leaks.
12. Shut off the engine, wait 15-20 minutes, and re-check the oil level, topping off as necessary.

Common Issues / Tips

• The Detroit Diesel engines in the Cascadia are known for their reliability, but proper oil maintenance is key. Using oil that meets both API CK-4 and the specific Detroit Diesel specification (DFS 93K222) is critical for warranty and longevity.
• Due to the large oil volume, a slow-draining filter can be a messy surprise. Be prepared with extra rags and a large drain pan.
• Always verify the correct oil filter part number with your VIN, as mid-year production changes can occur. The aftermarket cross-references provided are common but not guaranteed for every single application.

Need an oil change? Find a trusted shop on Repairius.