2021 Chevrolet Suburban Oil Capacity & Filter Guide

The 2021 Chevrolet Suburban with the 5.3L V8 engine takes 8.0 quarts (7.6 liters) of SAE 0W-20 engine oil, while the 6.2L V8 engine also takes 8.0 quarts (7.6 liters) of SAE 0W-20 engine oil. The optional 3.0L Duramax diesel engine requires 7.0 quarts (6.6 liters) of SAE 0W-30 engine oil.

Quick answer

• 5.3L V8 L84 & 6.2L V8 L87 Gasoline Engines:

  • Oil Capacity: 8.0 quarts (7.6 liters)
  • Recommended Oil Weight: SAE 0W-20
  • Oil Spec: Dexos1 Gen3 (or equivalent API SP)
  • OEM Oil Filter: Consult dealer for latest part number.
  • Fram Oil Filter Cross-Reference: PH12060
  • Wix Oil Filter Cross-Reference: 57045
  • Mobil 1 Oil Filter Cross-Reference: M1-113A

• 3.0L Duramax LM2 Diesel Engine:

  • Oil Capacity: 7.0 quarts (6.6 liters)
  • Recommended Oil Weight: SAE 0W-30
  • Oil Spec: DexosD (or equivalent API CK-4)
  • OEM Oil Filter: Consult dealer for latest part number.
  • Fram Oil Filter Cross-Reference: CH12800
  • Wix Oil Filter Cross-Reference: WA9773
  • Mobil 1 Oil Filter Cross-Reference: M1-137

Capacity by engine option

Oil change interval

For 2021 Chevrolet Suburban models, the oil change interval is primarily managed by the vehicle's Oil Life Monitoring (OLM) system. This system takes into account various factors like engine revolutions, operating temperature, and driving habits to determine when an oil change is necessary.

• Normal Duty: Under normal driving conditions, the OLM system typically recommends an oil change around 7,500 - 10,000 miles or 12 months, whichever comes first. Always follow the OLM system's indicator.
• Severe Duty: If you frequently drive in demanding conditions such as heavy towing, extensive idling, dusty environments, or extreme temperatures, your OLM will likely suggest more frequent oil changes. It's not uncommon for the OLM to trigger an oil change notice as early as 3,000 - 5,000 miles under severe duty. Pay close attention to the OLM and perform an oil change when indicated.

Drain plug torque

For all 2021 Chevrolet Suburban gasoline engines (5.3L V8 and 6.2L V8), the engine oil drain plug torque specification is 18 lb-ft (24 Nm).

For the 3.0L Duramax diesel engine, the engine oil drain plug torque specification is 22 lb-ft (30 Nm).

Always use a new drain plug gasket or crush washer when performing an oil change to ensure a proper seal and prevent leaks. The original drain plug for the gasoline engines often uses a single-use gasket, while the Duramax diesel engine typically uses an O-ring on the drain plug.

How to change the oil

1. Preparation: Ensure the engine is warm but not hot, then safely lift and support the front of the vehicle. Place a drain pan underneath the oil pan.
2. Drain Oil: Locate the oil drain plug, remove it carefully, and allow all the old oil to drain completely. Inspect the drain plug and replace the gasket/crush washer.
3. Replace Filter: Locate the oil filter, use an oil filter wrench to remove it, and allow any remaining oil to drain. Apply a thin film of new oil to the gasket of the new filter before screwing it on by hand until snug. Then, tighten an additional 3/4 to 1 full turn, or as specified by the filter manufacturer.
4. Refill Oil: Reinstall the drain plug and torque it to the correct specification. Lower the vehicle, then remove the oil filler cap and carefully pour in the recommended amount of new, specified engine oil.
5. Check Level & Inspect: Start the engine and let it run for a few minutes to circulate the new oil. Turn off the engine, wait a few minutes for the oil to settle, then check the oil level with the dipstick. Top off if necessary. Inspect for any leaks around the drain plug and oil filter.

Common issues / tips

• Oil Life Monitor (OLM) System: The 2021 Suburban relies heavily on its OLM. Do not simply follow a fixed mileage interval; instead, adhere to what the OLM indicates on your dashboard. Reset the OLM after every oil change.
• Correct Oil Specification is Crucial: For gasoline engines, using Dexos1 Gen3 is vital for engine longevity and warranty compliance. For the diesel engine, DexosD (or API CK-4) is equally important. Using incorrect oil can lead to premature engine wear and potential issues with emissions systems.
• Spin-on vs. Cartridge Filters: Note that the gasoline engines use a traditional spin-on oil filter, while the 3.0L Duramax diesel engine uses a cartridge-style oil filter located on top of the engine.
• Engine Air Filter: Consider inspecting or replacing the engine air filter at every other oil change, or more frequently if driving in dusty conditions, to help maintain optimal engine performance and fuel economy.

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