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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 1 (ENGINE CONTROLS - SERVICE & ADJUSTMENT SPECIFICATIONS - 5.3L)QUICK-SERVICESERVICE INTERVALS & SPECIFICATIONS
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Service Intervals & Specifications

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Service Intervals & Specifications
WARNING: This page is about a different variant/trim than selected.
REPLACEMENT INTERVALS (AVALANCHE, ESCALADE, SUBURBAN, TAHOE, YUKON & YUKON XL)

Component Interval (Miles)
Accessory Drive Belt (1) 60,000
Air Filter 30,000
Automatic Transfer Case Fluid 50,000
Automatic Transmission Fluid & Filter (2)
Engine Coolant 150,000
Fuel Filter 30,000
Oil & Oil Filter (3)
PCV 100,000
Spark Plugs 100,000
(1) Inspect and replace as necessary.
(2) If vehicle's GVWR is greater than 8600 lbs (3900 kg) or if used under severe conditions, replace every 50,000 miles. If used under normal conditions, replace every 100,000 miles.
(3) If used under severe conditions, replace every 3000 miles. If used under normal conditions, replace as indicated by CHANGE OIL SOON light or every 12 months, whichever comes first.
REPLACEMENT INTERVALS (CHEVY EXPRESS & SAVANNA)

Component Interval (Miles)
Accessory Drive Belt (1) 60,000
Air Filter 30,000
Automatic Transmission Fluid & Filter (2)
Engine Coolant 150,000
Fuel Filter 30,000
Oil & Oil Filter (3)
Spark Plugs 100,000
(1) Inspect and replace as necessary.
(2) If vehicle's GVWR is greater than 8600 lbs (3900 kg) or if used under severe conditions, replace every 50,000 miles. If used under normal conditions, replace every 100,000 miles.
(3) If used under severe conditions, replace every 3000 miles. If used under normal conditions, replace as indicated by CHANGE OIL SOON light or every 12 months, whichever comes first.
REPLACEMENT INTERVALS (SIERRA & SILVERADO)

Component Interval (Miles)
Accessory Drive Belt (1) 60,000
Air Filter 30,000
Automatic Transfer Case Fluid 50,000
Automatic Transmission Fluid & Filter (2)
Engine Coolant 150,000
Fuel Filter 30,000
Manual Transmission Fluid 150,000
Oil & Oil Filter (3)
PCV 100,000
Spark Plugs 100,000
(1) Inspect and replace as necessary.
(2) If vehicle's GVWR is greater than 8600 lbs (3900 kg) or if used under severe conditions, replace every 50,000 miles. If used under normal conditions, replace every 100,000 miles.
(3) If used under severe conditions, replace every 3000 miles. If used under normal conditions, replace as indicated by CHANGE OIL SOON light or every 12 months, whichever comes first.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.