1999 GMC C3500 HD 6.5 F, StandardFACTORY OEM SERVICE PROCEDURE

Quick Lookups: Fluids

FLUID CAPACITIES
Fluid Type Application Standard Metric Fluid Spec Note S/H
Air Cond Refrigerant 2.00 LBS. 0.9 KG R-134a H
Automatic Transmission Fluid Overhaul 13.50 QTS. 12.77 L Automatic Transmission Fluid DEXRON VI Refer to TSB No. 04-07-30-037C, Date of Issue: April 11, 2007. H
Automatic Transmission Fluid Pan Removal and Replacement 7.70 QTS. 7.28 L Automatic Transmission Fluid DEXRON VI Refer to TSB No. 04-07-30-037C, Date of Issue: April 11, 2007. H
Brake Fluid N/A N/A DOT 3 Brake Fluid H
Clutch Fluid N/A N/A DOT 3 Brake Fluid H
Differential Gear Oil 10.5" Ring Gear 3.30 QTS. 3.12 L SAE 80W-90 Gear Oil or equivalent H
Differential Gear Oil 8.5" Ring Gear 2.10 QTS. 1.98 L SAE 80W-90 Gear Oil or equivalent H
Differential Gear Oil 9.5" Ring Gear 3.50 QTS. 3.31 L SAE 80W-90 Gear Oil or equivalent H
Differential Gear Oil Dana 11" Ring Gear 4.20 QTS. 3.97 L SAE 75W-140 Synthetic Gear Oil H
Differential Gear Oil Locking Differential 2.70 QTS. 2.55 L SAE 80W-90 Gear Oil or equivalent DO NOT add Friction Modifier. H
Engine Coolant 6.5L Eng 25.00 QTS. 23.65 L 50/50 mixture of DEX-COOL and clean, drinkable water H
Engine Oil 6.5L Eng w/Filter 8.00 QTS. 7.57 L API - CH-4/CG-4, SAE 15W-40 SAE 15W-40 is best for your vehicle. However, you can use SAE 10W-30 if it's going to be colder than (0°C) 32°F before your next oil change. When it's very cold, below (-18°C) 0°F, you should use SAE 10W-30 to improve cold starting. SAE 30 may be used at temperatures above freezing, (0°C) 32°F. These numbers on the oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 10W-40 or SAE 20W-50. H
Fuel Tank 40.00 GALS. 151.41 L H
Manual Transmission Fluid w/Low Gear,RPO MW3 4.00 QTS. 3.78 L GM Goodwrench Synthetic Manual Transmission Fluid or equivalent SAE 75W-90 GL-4 Gear Oil H
Power Steering Fluid 1.00 QTS. 0.94 L GM Power Steering Fluid H
Windshield Washer Fluid N/A N/A Optikleen Windshield Washer Fluid Follow the Manufacturer's Instructions for the mixture ratio. H
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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