2020–2026 Chevy Silverado HD / GMC Sierra HD 6.6L V8 gas 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 Silverado HD owner's manual (Sierra HD is the same truck); other years of this generation may differ slightly.
| Item | Normal driving | Severe use |
|---|---|---|
| Oil and filter changeWhen the dash shows CHANGE ENGINE OIL SOON (change it within 600 miles), 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 boots; grease any fittingsGM lists this at every 7,500-mile service; grease fittings at every oil change. | Every 7,500 miles or 1 year | Every 7,500 miles or 1 year |
| Replace engine air filterWhen the air filter life monitor says, or every four years. | Every 4 years | Every 4 years |
| Replace spark plugs | Every 97,500 miles | Every 97,500 miles |
| Change transfer case fluid (4x4) | Every 45,000 miles | Every 22,500 miles |
| Change automatic transmission fluid and filter | Not required | Every 45,000 miles |
| Drain and fill engine cooling system | Every 150,000 miles or 5 years | Every 150,000 miles or 5 years |
| Replace brake fluid | Every 5 years | Every 5 years |
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