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2021 Chevrolet Tahoe maintenance schedule

Written in plain English and reviewed by the eli5cars editorial team ยท Last reviewed June 2026

5.3L EcoTec3 V8 (355 hp), 6.2L EcoTec3 V8 (420 hp, High Country/RST Performance), or 3.0L Duramax inline-6 turbo-diesel (277 hp)LSLTRSTMSRP $50,295

Jump to a mileage milestone:

Full service timeline

MileageService itemsDetails
5k mi
  • Engine oil and filter change โ€” dexos1 0W-20 full synthetic for 5.3L/6.2L V8 gas engines; GM oil life monitor governs exact interval, typically 5k-7.5k under normal use (Duramax diesel: 5W-40 full synthetic diesel-rated oil, check monitor)
  • Tire rotation
  • Inspect brake pads and rotors โ€” front and rear
  • Inspect front and rear differential fluid level (4WD models)
10k mi
  • Engine oil and filter change โ€” dexos1 0W-20 (gas) or 5W-40 (Duramax diesel)
  • Tire rotation
  • Inspect cabin air filter condition
  • Inspect Autotrac/4WD transfer case fluid level
  • Inspect diesel exhaust fluid (DEF) level โ€” Duramax models
15k mi
  • Engine oil and filter change per oil life monitor
  • Tire rotation
  • Inspect brake fluid color and level
  • Inspect front and rear driveshaft U-joints (4WD models)
  • Inspect GM 10-speed automatic transmission fluid condition (10L80/10L90)
30k mi
  • Engine oil and filter change โ€” dexos1 0W-20 (gas) or 5W-40 (Duramax)
  • Tire rotation
  • Replace cabin air filter
  • Replace engine air filter
  • Inspect spark plugs โ€” 5.3L/6.2L V8 iridium (factory interval ~97,500 miles under GM's extended schedule; inspect at 30k)
  • Inspect front differential fluid (4WD โ€” GM 75W-85 synthetic gear oil)
  • Inspect transfer case fluid (4WD โ€” GM Autotrac fluid)
  • Inspect rear axle fluid โ€” GM 75W-90 synthetic (limited-slip requires friction modifier additive)
  • Replace fuel filter โ€” Duramax diesel models (severe-duty interval)
View โ†’
60k mi
  • Engine oil and filter change โ€” dexos1 0W-20 (gas) or 5W-40 (Duramax)
  • Tire rotation
  • Replace cabin air filter
  • Replace engine air filter
  • Replace brake fluid โ€” DOT 3
  • Replace front differential fluid โ€” GM 75W-85 synthetic (4WD models)
  • Replace transfer case fluid โ€” GM Autotrac fluid (4WD models)
  • Replace rear axle fluid โ€” GM 75W-90 synthetic
  • Inspect GM 10-speed automatic transmission fluid โ€” replace under severe-duty/towing schedule
  • Inspect serpentine belt โ€” all engine variants
  • Inspect coolant condition (GM Dex-Cool extended-life orange โ€” first change at 100k-150k)
View โ†’
90k mi
  • Engine oil and filter change per oil life monitor
  • Tire rotation
  • Replace cabin air filter
  • Inspect serpentine belt condition โ€” replace if cracked or glazed
  • Inspect front CV axle shafts and boots (4WD front axle)
  • Inspect air suspension components (Premier/High Country magnetic ride control models)
  • Inspect brake calipers, hardware, and parking brake cables
View โ†’
98k mi
  • Engine oil and filter change per oil life monitor
  • Replace spark plugs โ€” 5.3L/6.2L EcoTec3 V8 iridium (GM factory interval: 97,500 miles under normal schedule)
  • Tire rotation
120k mi
  • Engine oil and filter change โ€” dexos1 0W-20 (gas) or 5W-40 (Duramax)
  • Tire rotation
  • Replace engine coolant โ€” GM Dex-Cool extended-life (first change at 100k-150k, then per monitor)
  • Replace GM 10-speed automatic transmission fluid
  • Replace front differential fluid โ€” GM 75W-85 (4WD)
  • Replace transfer case fluid โ€” GM Autotrac fluid (4WD)
  • Replace rear axle fluid โ€” GM 75W-90
  • Replace serpentine belt if not already replaced
  • Full brake system flush โ€” DOT 3
  • Inspect and service front wheel bearings and hub assemblies
View โ†’

Upgrading your Tahoe's wheels?

See verified wheel fitments for the 2021 Chevrolet Tahoe โ€” bolt pattern, hub bore, and offset all checked.

Verified Tahoe fitments at AlloyHaus โ†’

AlloyHaus is our sister site โ€” built by the same maker as eli5cars.

Check engine light on? Get a free code scan

If your check engine light is on, most auto-parts stores (AutoZone, O'Reilly, Advance) will read the code for FREE โ€” no purchase required, just walk in. Bring the code back here and look it up at eli5cars.com/obd2 for the plain-English explanation.

Note: a scan only helps when there's an active fault code. For purely mechanical symptoms (noises, vibrations, leaks), a scan may show nothing โ€” the suspects listed above are your starting point.