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2025 GMC Sierra 3500 maintenance schedule

The 2025 Sierra 3500 is part of the GMT T1XX generation (2020-2026), sold as a pickup. Below: its service intervals with the source behind each one, the fluids it takes, and the NHTSA recalls issued for it.

Service schedule

What the 2025 Sierra 3500 needs, and when

1 of these 12 items comes from GMC's own published schedule. Manufacturer rows link to GMC's own schedule, Independent rows to a service shop or parts retailer's published guide.

ServiceIntervalSource
Engine oil and filter

Check OLM indicator

7,500 mi / 1 yearIndependent
Engine air filter

Diesel may require earlier replacement; 45,000 mi is a check cadence, not a confirmed replacement interval

Inspect, replace as neededIndependent
Cabin air filter

Replace more frequently in dusty environments

22,500 mi / 2 yearsIndependent
Tire rotation

Check tread wear and balance

7,500 mi / 1 yearIndependent
Brake fluid60,000 mi / 5 yearsIndependent
Engine coolant

DEX-COOL drain and replenish

150,000 mi / 5 yearsIndependent
Transmission fluid

Severe duty towing interval

45,000 miIndependent
Spark plugs (Gas)97,500 miIndependent
Serpentine belt

Inspect accessory drive belts

150,000 mi / 10 yearsIndependent
Differential and transfer case fluid

For 4WD models

45,000 miIndependent
PCV valve (Gas)Inspect, replace as neededManufacturer
12V battery

Test cold-cranking amps annually

Inspect, replace as neededIndependent

Intervals are for normal driving; towing, short trips, extreme heat or dust shorten them. Services we could not find an interval for are left off rather than guessed.

Fluids and engines

What goes in it

Engine oil
5W-30 / 15W-40
Coolant
DEX-COOL
Transmission fluid
DEXRON ULV

Powertrains in this generation

  • 6.6L 8-cyl (L8T), 401 hp, 6-Speed/10-Speed, RWD/4WD
  • 6.6L 8-cyl diesel (L5P), 445 hp, 10-Speed Allison, RWD/4WD

Confirm the exact spec against the owner's manual or the label under the hood; capacities vary by engine and drivetrain.

Safety recalls

1 NHTSA recall for the 2025 GMC Sierra 3500

From NHTSA's recall database, matched by model and year. Recall repairs are free at GMC dealers, and a given car may already be fixed or fall outside a campaign, so check the VIN at nhtsa.gov/recalls before you buy.

Fuel system, gasoline

NHTSA 26V129000

March 2026

General Motors, LLC (GM) is recalling certain 2025-2026 Chevrolet Silverado 3500, and GMC Sierra 3500 vehicles with gasoline engines and dual fuel tanks (RPOs L8T and N2N). The rear fuel pump may not transfer adequate fuel to the front tank, causing an engine stall.

Remedy: The vehicle's engine control module (ECM) will be updated by a dealer or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed April 8, 2026. Owners may contact GMC customer service at 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N262544420. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on March 5, 2026.

Running costs

What maintenance typically costs

A typical year of maintenance
$912
Five years of maintenance
$4,560
The major service near 100,000 mi
$1,500

Typical US independent-shop estimates for this generation; they vary by region and condition.

Other Sierra 3500 model years

GMT T1XX (2020-2026)

2020202120222023202420252026

GMT K2XX (2015-2019)

20152016201720182019

GMT900 (2014-2014)

2014

Shopping new? The GMC Sierra 3500 guide covers the current model, with what it costs to keep for 1 to 15 years.

Sources

Researched 2026-09-19. Modeling, not mechanic advice - always confirm against your car's owner's manual and service records.

Running a Sierra 3500 for income?

Carlyle scores the exact listing on cost per remaining mile and projected Turo income, so you know what a 2025 Sierra 3500 earns before you buy it.

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