2006 GMC Sierra 2500 HD, 4D Pickup Extra Cab, 6.6 D, 4WD, StandardFACTORY OEM SERVICE PROCEDURE

Quick Lookups: Fluids

FLUID CAPACITIES
Fluid Type Application Standard Metric Fluid Spec Note S/H
Air Cond Compressor Oil Diesel w/o Rear AC 7.00 OZS. 0.2 L PAG 46 S
Air Cond Compressor Oil Diesel w/Rear A/C 11.00 OZS. 0.32 L PAG 46 S
Air Cond Refrigerant 1.60 LBS. 0.72 KG R-134a S
Brake Fluid N/A N/A DOT 3 Brake Fluid S
Differential Gear Oil Front Axle 8.25" 1.51 QTS. 1.42 L Front Axle (1500 Series 4WD): SAE 80W-90 Gear Oil. Front Axle (1500, 2500 HD, and 3500 HD Series): SAE 75W-90 Synthetic Gear Oil. S
Differential Gear Oil Front Axle 9.25" 1.83 QTS. 1.73 L Front Axle (1500 Series 4WD): SAE 80W-90 Gear Oil. Front Axle (1500, 2500 HD, and 3500 HD Series): SAE 75W-90 Synthetic Gear Oil. S
Differential Gear Oil Rear Axle 10.5" 2.75 QTS. 2.6 L SAE 75W-90 Synthetic Gear Oil S
Differential Gear Oil Rear Axle 11.5" 3.17 QTS. 2.99 L SAE 75W-90 Synthetic Gear Oil S
Differential Gear Oil Rear Axle 8.6" 2.15 QTS. 2.03 L SAE 75W-90 Synthetic Gear Oil S
Differential Gear Oil Rear Axle 9.5" 2.75 QTS. 2.6 L SAE 75W-90 Synthetic Gear Oil S
Differential Gear Oil Rear Axle 9.75" 3.00 QTS. 2.83 L SAE 75W-90 Synthetic Gear Oil Rear Axle (Steerable): Synthetic Gear Oil; use ONLY GM Part No.12378557. DO NOT add Friction Modifier. S
Engine Coolant 6.6L Eng,Standard Trans 25.00 QTS. 23.65 L 50/50 mixture of DEX-COOL and clean, drinkable water After refill, the level must be checked. Add enough engine coolant so that the fluid is within the proper operating range. S
Engine Oil 6.6L Eng w/Filter 10.00 QTS. 9.46 L API - SAE 15W-40 Use ONLY engine oils that have one of these designations: CI-4 or CH-4 for DURAMAX diesel engines. Use SAE 10W-30 if temperatures stay above 0Deg.F (-18Deg.C) before your next oil change. When it is very cold, Below 0Deg.F (-18Deg.C), you should use SAE 5W-30 to improve cold starting and prevent engine damage. DO NOT use other viscosity oils such as SAE 10W-40 or SAE 20W-50. S
Engine Oil 6.6L Eng w/o Filter 9.20 QTS. 8.7 L API - SAE 15W-40 Use ONLY engine oils that have one of these designations: CI-4 or CH-4 for DURAMAX diesel engines. Use SAE 10W-30 if temperatures stay above 0Deg.F (-18Deg.C) before your next oil change. When it is very cold, Below 0Deg.F (-18Deg.C), you should use SAE 5W-30 to improve cold starting and prevent engine damage. DO NOT use other viscosity oils such as SAE 10W-40 or SAE 20W-50. S
Fuel Tank 2500 HD 36.00 GALS. 136.27 L S
Manual Transmission Fluid Trans Mfr CD S6-650/ML6 6.30 QTS. 5.96 L Synthetic Transmission Fluid Approved to Allison Transmission Specification: TES-295 (GM Part No. 12378515). S
Power Steering Fluid N/A N/A GM Power Steering Fluid GM Part No. 89021184. S
Windshield Washer Fluid N/A N/A Optikleen Windshield Washer Fluid Follow the Manufacturer's Instructions for the mixture ratio. S
Factory Service Tools

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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.

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