2020–2026 Chevy Silverado HD / GMC Sierra HD 6.6L Duramax diesel maintenance schedule
From the factory owner's manual. "Severe" is the schedule the manual gives for towing, plowing, heavy loads, lots of idling, dusty roads or extreme temperatures. Your truck's own manual and dash reminders come first.
From the 2022 Duramax supplement; other years of this generation may differ slightly.
| Item | Normal driving | Severe use |
|---|---|---|
| Oil and filter changeWhen the dash says to change it, and at least once a year. GM checks oil life at every 7,500-mile service. | Every 7,500 miles or 1 year | Every 7,500 miles or 1 year |
| Tire rotation and required services | Every 7,500 miles | Every 7,500 miles |
| Inspect steering, suspension and chassis partsPart of GM's required services at every 7,500 miles. | Every 7,500 miles or 1 year | Every 7,500 miles or 1 year |
| Replace fuel filterOr sooner when the dash shows CHANGE FUEL FILTER. More often when towing for long periods, off-road, in heavy dust or on biodiesel. | Every 22,500 miles or 2 years | Every 22,500 miles or 2 years |
| Drain and fill engine cooling system | Every 150,000 miles or 5 years | Every 150,000 miles or 5 years |
| Replace engine air filterWhen the air filter life monitor says, or every four years. | Every 4 years | Every 4 years |
| Change automatic transmission fluid and filter | Not required | Every 45,000 miles |
What's due next?
Sources
Applies to
Chevrolet Silverado 2500HD: 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026
Chevrolet Silverado 3500HD: 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026
GMC Sierra 2500HD: 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026
GMC Sierra 3500HD: 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026