2021 Kenworth T680 Oil Capacity & Filter

The 2021 Kenworth T680 typically holds between 38 and 48 quarts of oil, depending on the engine and oil pan configuration.

Quick Answer

• Oil Capacity: 38 - 48 quarts (36 - 45.4 Liters)
• Recommended Oil Weight: 10W-30 or 15W-40, depending on ambient temperature and engine manufacturer specifications.
• Oil Specification: API CK-4 or API FA-4 (consult engine manufacturer for specific recommendation).
• Oil Filter (PACCAR MX-13):
  • OEM: PACCAR K27-1002
  • Wix: 57971XE
  • Fram: CH11955
  • Mobil 1: M1-110

Capacity by Engine Option

Note: Capacities can vary based on oil pan design and whether the vehicle is equipped with an oil bypass filtration system. Always refer to your owner's manual or engine manufacturer's documentation for the most accurate information.

Oil Change Interval

Normal Duty: 40,000 - 60,000 miles or 500 hours, whichever comes first.

Severe Duty: 20,000 - 40,000 miles or 300-400 hours, whichever comes first. Severe duty conditions include frequent idling, heavy loads, extreme temperatures, or dusty environments. Used oil analysis (UOA) is highly recommended for optimizing oil change intervals in heavy-duty applications.

Drain Plug Torque

• PACCAR MX-13: 52 lb-ft (70 N·m)
• Cummins X15: 60 lb-ft (81 N·m)

Always use a new crush washer or seal with each oil change to ensure a leak-free seal. Consult your engine's service manual for the exact torque specification for your specific engine and oil pan.

How to Change the Oil

1. Warm up the engine: Drive the truck for 15-20 minutes to bring the oil to operating temperature, allowing it to drain more easily.
2. Park and secure: 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 large drain pan under the oil pan. Remove the drain plug with the appropriate wrench, allowing the oil to drain completely.
4. Replace filter: Once the oil has drained, remove the old oil filter using an oil filter wrench. Apply a thin layer of new oil to the gasket of the new filter before threading it on. Hand-tighten until snug, then turn an additional 3/4 to 1 full turn (or as per filter instructions).
5. Reinstall drain plug: Install a new crush washer on the drain plug and thread it back into the oil pan. Tighten to the manufacturer's specified torque.
6. Add new oil: Using a funnel, add the recommended amount and type of new engine oil. Start with a slightly lower amount and check the dipstick frequently.
7. Check for leaks and level: Start the engine and let it run for a few minutes. Shut off, wait 5-10 minutes, and check the oil level on the dipstick. Top off as needed. Inspect around the drain plug and filter for any leaks.

Common Issues / Tips for this Generation

• Oil Consumption: Some heavy-duty diesel engines, including those found in the T680, may exhibit minor oil consumption. Monitor your oil level regularly between changes.
• DPF and Emissions Systems: The correct API CK-4 or FA-4 oil is crucial for the longevity of the Diesel Particulate Filter (DPF) and other emissions components. Using incorrect oil can lead to premature DPF clogging and costly repairs.
• Fuel Dilution: In some operating conditions, fuel dilution in the engine oil can occur. This is another reason why used oil analysis is beneficial, as it can detect fuel dilution and suggest earlier oil change intervals if necessary.
• Advanced Engine Electronics: The 2021 T680 features sophisticated engine management systems. Always ensure proper diagnostic procedures are followed if any engine-related issues arise after an oil change.

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