2025 GMC Sierra 2500HD Oil Capacity & Filter

The 2025 GMC Sierra 2500HD requires 6.0 quarts (5.7 liters) of 5W-30 dexosD compliant full synthetic motor oil for the 6.6L L8T gasoline engine, and 10 quarts (9.5 liters) of 15W-40 or 10W-30 dexosD compliant full synthetic diesel engine oil for the 6.6L L5P Duramax diesel engine.

Quick Answer

6.6L L8T Gasoline Engine

• Oil Capacity: 6.0 quarts (5.7 liters)
• Recommended Oil Weight: SAE 5W-30
• Oil Spec: dexosD compliant full synthetic
• OEM Oil Filter: Consult dealer for latest part number
• Aftermarket Oil Filter Cross-References:
  • Fram: Consult Fram catalog for latest part number
  • Wix: Consult Wix catalog for latest part number
  • Mobil 1: Consult Mobil 1 catalog for latest part number

6.6L L5P Duramax Diesel Engine

• Oil Capacity: 10 quarts (9.5 liters)
• Recommended Oil Weight: SAE 15W-40 (preferred) or SAE 10W-30
• Oil Spec: dexosD compliant full synthetic diesel engine oil
• OEM Oil Filter: Consult dealer for latest part number
• Aftermarket Oil Filter Cross-References:
  • Fram: Consult Fram catalog for latest part number
  • Wix: Consult Wix catalog for latest part number
  • Mobil 1: Consult Mobil 1 catalog for latest part number

Capacity by Engine Option

Oil Change Interval

GMC recommends following the Oil Life Monitoring (OLM) system for determining oil change intervals on your 2025 Sierra 2500HD. The OLM system takes into account various factors like engine revolutions, operating temperature, and driving habits to calculate the optimal oil change interval.

• Normal Duty: Typically, the OLM will recommend an oil change every 7,500 to 10,000 miles or 12 months, whichever comes first.
• Severe Duty: If your driving conditions involve frequent short trips, extensive idling, towing heavy loads, or operation in extremely dusty or cold environments, the OLM will reduce the recommended interval, potentially to as low as 3,000 to 5,000 miles or 3-6 months. Always adhere to the OLM's indication.

Drain Plug Torque

• 6.6L L8T Gasoline Engine: The oil drain plug generally requires a torque of 18 lb-ft (24 Nm). Always use a new drain plug gasket/crush washer to ensure a proper seal and prevent leaks. Consult your owner's manual or a service manual for the most accurate and up-to-date specification.
• 6.6L L5P Duramax Diesel Engine: The oil drain plug typically requires a torque of 33 lb-ft (45 Nm). A new drain plug gasket/crush washer is crucial for a leak-free seal. Always consult your owner's manual or a service manual for the most accurate and up-to-date specification.

How to Change the Oil (General Steps)

1. Gather Supplies: New oil, oil filter, drain plug crush washer, drain pan, wrench/socket for drain plug, oil filter wrench, funnel, rags, safety glasses, and gloves.
2. Warm Up Engine (Optional but Recommended): Drive the truck for a few minutes to bring the oil to operating temperature. This helps the oil drain more completely.
3. Lift and Secure Vehicle: Safely lift the front of the truck using a jack and secure it with jack stands. Ensure the vehicle is level for proper draining.
4. Locate Drain Plug: Place the drain pan underneath the oil pan and carefully remove the drain plug. Allow all the old oil to drain out completely.
5. Replace Drain Plug: Install a new crush washer on the drain plug and reinsert it, tightening it to the specified torque.
6. Replace Oil Filter: Locate the oil filter. Place the drain pan underneath it, then use an oil filter wrench to remove it. Apply a thin coat of new oil to the gasket of the new filter before threading it on by hand until snug, then tighten an additional 3/4 to 1 full turn (or as specified by the filter manufacturer). Do not overtighten.
7. Add New Oil: Using a funnel, add the recommended amount and type of new oil. Start with a bit less than the full capacity and check the dipstick.
8. Check Oil Level: Start the engine and let it run for a minute or two to circulate the new oil. Shut off the engine, wait a few minutes for the oil to settle, then check the dipstick. Add more oil as needed until the level is within the safe range.
9. Reset Oil Life Monitor: Refer to your owner's manual for instructions on how to reset the Oil Life Monitoring system.
10. Dispose of Old Oil: Properly dispose of the used oil and filter at an authorized recycling center.

Common Issues / Tips

• Duramax Diesel Oil: The 6.6L L5P Duramax diesel engine is very sensitive to oil quality. Always use dexosD compliant full synthetic diesel engine oil. Using non-compliant oil can lead to premature wear and potential warranty issues.
• Regeneration and Oil Dilution (Diesel): For Duramax owners, be aware that the Diesel Particulate Filter (DPF) regeneration process can sometimes lead to minor fuel dilution in the engine oil. This is a normal process, but it reinforces the importance of adhering to the OLM and using the correct oil type.
• Oil Filter Selection: While aftermarket filters are available, many owners prefer to use genuine OEM AC Delco oil filters for both gasoline and diesel engines to ensure optimal filtration and fitment. If using an aftermarket filter, ensure it meets or exceeds OEM specifications.
• Consult Owner's Manual: For the most accurate and up-to-date information on capacities, specifications, and procedures, always refer to your 2025 GMC Sierra 2500HD owner's manual.

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