2018 GMC Sierra 3500 maintenance schedule

The 2018 Sierra 3500 is part of the GMT K2XX generation (2015-2019), 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 2018 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

Inspect at oil changes; 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-VI

Powertrains in this generation

  • 6.0L 8-cyl (L96), 360 hp, 6-Speed Automatic, RWD/4WD
  • 6.6L 8-cyl diesel (LML), 397 hp, 6-Speed Allison, RWD/4WD
  • 6.6L 8-cyl diesel (L5P), 445 hp, 6-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

6 NHTSA recalls for the 2018 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.

October 2024

General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, GMC Sierra 1500, 2018-2019 Chevrolet Silverado 2500, 3500, and GMC Sierra 2500, 3500 Crew Cab trucks. The left or right-side roof-rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.

Remedy: Dealers will replace the left and right side RRAB modules, free of charge. Owner notification letters were mailed November 8, 2024. Owners may contact Chevrolet customer service at 1-800-222-1020, and GMC Customer Service at 888-988-7267. GM's number for this recall is N242474500.

Fuel system, diesel

NHTSA 23V047000

February 2023

General Motors, LLC (GM) is recalling certain 2017-2019 Chevrolet Silverado 2500, 3500, and GMC Sierra 2500, 3500 vehicles equipped with a dual fuel tank option. The rear fuel tank may collapse and prevent the fuel pump from transferring fuel to the front tank, resulting in an engine stall.

Remedy: Dealers will inspect the fuel tank and fuel pump module, replacing them as necessary. Dealers will also add a vent hose to the rear tank assembly. Repairs will be performed free of charge. An interim owner notification letter informing owners of the safety risk was mailed on March 15, 2023. Owner notification letters were mailed June 21, 2023. Owners may contact Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-800-462-8782. GM's number for this recall is N222368030.

July 2021

General Motors, LLC (GM) is recalling certain 2017-2019 Chevrolet Silverado 2500, 3500 and 2017-2019 GMC Sierra 2500 and 3500 vehicles equipped with a Duramax diesel 6.6 liter engine and an optional engine-block heater cord. An electrical short-circuit may occur in the engine-block heater cable or in the terminals that connect the heater cable to the block heater.

Remedy: Dealers will replace engine block heaters and heater cords. Vehicles that have this feature disabled as a remedy to the safety condition will be contacted and offered replacement block heaters and heater cords under a separate customer satisfaction program, free of charge. GM will provide free replacement block heaters and cords under a separate customer satisfaction campaign. For vehicles previously included in recall 19V-328, the heater cord will be replaced and rerouted, free of charge. Interim owner notifications were mailed on August 13, 2021. Owner notification letters are expected to be mailed on April 4, 2022. Customers may call GMC customer service at 1-800-462-8782. GM's number for this recall is 212329840.

April 2019

General Motors LLC (GM) is recalling certain 2019 Chevrolet Silverado 4500, 5500 and 6500 vehicles and 2017-2019 Chevrolet Silverado 2500 and 3500 vehicles and GMC Sierra 2500 and 3500 vehicles equipped with Duramax 6.6 liter diesel engines and an optional engine-block heater. The engine block heater cord or the terminals that connect the heater cord to the block heater may short circuit and fail.

Remedy: GM will contact owners, dealers will replace the engine block heater, free of charge. Additionally, in Chevrolet Silverado 2500 and 3500 vehicles, dealers will install a new rerouted heater cord. The recall began December 11, 2019. Owners may contact GM customer service at 1-586-596-1733. GM's number for this recall is N182206310.

Fuel system, gasoline

NHTSA 19V088000

February 2019

General Motors, LLC (GM) is recalling certain 2016-2018 GMC Sierra 3500 and Chevrolet Silverado 3500 trucks equipped with gasoline engines and dual fuel tanks. The fuel-level sensor in the front tank may stick in a low-level position, allowing the rear tank to overfill the front tank.

Remedy: GM has notified owners, and dealers will replace the rear-tank fuel-pump module, inspect the front tank and, if necessary, replace the front tank, free of charge. The recall began July 30, 2019. GM's number for this recall is N182204190.

Seat belts

NHTSA 17V567000

September 2017

General Motors (GM) is recalling certain 2017-2018 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 trucks. The front seat belt retractor assemblies were built with the incorrect torsion bar. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 209, "Seat Belt Assemblies."

Remedy: GM will notify owners, and dealers will replace both front seat belt retractor assemblies, free of charge. The recall began March 24, 2021. Owners may contact GMC customer service at 1-888-988-7267 or Chevrolet customer service at 1-800-222-1020. GM's numbers for this recall are 17368, 17375, and 17376.

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)

GMT K2XX (2015-2019)

GMT900 (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 2018 Sierra 3500 earns before you buy it.

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