Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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2020 GMC Sierra 2500 HD AT4, 6.6L Eng VIN Y
Quick Lookups: Fluids
2020 GMC Sierra 2500 HD AT4, 6.6L Eng VIN YSECTION Fluids
| FLUID CAPACITIES | |||||||
|---|---|---|---|---|---|---|---|
| Fluid Type | Application | Standard | Metric | Fluid Spec | Note | S/H | |
| Air Cond Compressor Oil | 3.40 OZS. | 0.1 L | PAG Oil (R-134a) | S | |||
| Air Cond Refrigerant | Eng CD L5P | 1.50 LBS. | 0.68 KG | R-134a | S | ||
| Automatic Transmission Fluid | Trans Mfr CD 10L1000/MGM | Including Cooler Volumen | 22.08 QTS. | 20.89 L | Automatic Transmission Fluid DEXRON ULV | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S |
| Automatic Transmission Fluid | Trans Mfr CD 10L1000/MGM | Pan Removal, Valve Body and/or Filter Replacement | 14.37 QTS. | 13.59 L | Automatic Transmission Fluid DEXRON ULV | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S |
| Automatic Transmission Fluid | Trans Mfr CD 10L1000/MGM | Transmission Volume Only | 20.60 QTS. | 19.49 L | Automatic Transmission Fluid DEXRON ULV | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S |
| Brake Fluid | N/A | N/A | DOT 3 Hydraulic Brake Fluid | S | |||
| Diesel Exhaust Fluid | 7.00 GALS. | 26.49 L | Diesel Exhaust Fluid | Approximate capacity. Diesel Exhaust Fluid or diesel exhaust fluid that meets ISO 22241-1 or displays the API Diesel Exhaust Fluid Certification Mark. | S | ||
| Differential Gear Oil | Front Axle 1000 Series,8.25" | 1.51 QTS. | 1.42 L | SAE 75W-90 Synthetic Axle Lubricant | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S | |
| Differential Gear Oil | Front Axle 2000 Series,9.25" | 1.90 QTS. | 1.79 L | SAE 75W-90 Synthetic Axle Lubricant | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S | |
| Differential Gear Oil | Rear Axle 1000 Series,9.5" LD | 2.75 QTS. | 2.6 L | SAE 75W-90 Synthetic Axle Lubricant | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S | |
| Differential Gear Oil | Rear Axle 1000 Series,9.76" LD | 2.75 QTS. | 2.6 L | SAE 75W-90 Synthetic Axle Lubricant | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S | |
| Differential Gear Oil | Rear Axle 1000 Series,w/o RPO AXN,8.6" | 2.15 QTS. | 2.03 L | SAE 75W-90 Synthetic Axle Lubricant | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S | |
| Differential Gear Oil | Rear Axle 2000 Series,10.50" | 2.75 QTS. | 2.6 L | SAE 75W-90 Synthetic Axle Lubricant | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S | |
| Differential Gear Oil | Rear Axle 3000 Series,11.50" | 3.17 QTS. | 2.99 L | SAE 75W-90 Synthetic Axle Lubricant | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S | |
| Engine Coolant | Diesel | Engine Cooling System | 30.70 QTS. | 29.05 L | 50/50 mixture of DEX-COOL and clean, drinkable water | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S |
| Engine Coolant | Diesel | Fuel Cooling System | 2.00 QTS. | 1.89 L | 50/50 mixture of DEX-COOL and clean, drinkable water | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S |
| Engine Oil | Diesel | w/Filter | 10.00 QTS. | 9.46 L | API - SAE 15W-40 | Oils designated as API CJ-4 or CK-4 are required for the vehicle. The CJ-4 or CK-4 designation can appear either alone or in combination with other American Petroleum Institute (API) designations, such as API CJ-4/SL. These letters show API levels of quality. When it is very cold, below 0Deg. F (-18Deg.C), you should use SAE 5W-40 to improve cold starting. Do not use other viscosity such as SAE 10W-30, SAE 10W-40, or SAE 20W-50. | S |
| Engine Oil | Diesel | w/o Filter | 9.20 QTS. | 8.7 L | API - SAE 15W-40 | Oils designated as API CJ-4 or CK-4 are required for the vehicle. The CJ-4 or CK-4 designation can appear either alone or in combination with other American Petroleum Institute (API) designations, such as API CJ-4/SL. These letters show API levels of quality. When it is very cold, below 0Deg. F (-18Deg.C), you should use SAE 5W-40 to improve cold starting. Do not use other viscosity such as SAE 10W-30, SAE 10W-40, or SAE 20W-50. | S |
| Fuel Tank | Diesel,Pickup Crew Cab | 29.40 GALS. | 111.29 L | S | |||
| Power Steering Fluid | Diesel | w/NV8 | 1.40 QTS. | 1.32 L | GM Power Steering Fluid | GM Part No. 89021184. Approximate capacity. | S |
| Power Steering Fluid | Diesel | w/o NV8 | 1.20 QTS. | 1.13 L | GM Power Steering Fluid | GM Part No. 89021184. Approximate capacity. | S |
| Transfer Case Fluid | T/Case Mfr CD 3023-4/NQH | 1.60 QTS. | 1.51 L | Automatic Transmission Fluid DEXRON VI | All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling. | S | |
| Windshield Washer Fluid | N/A | N/A | Windshield Washer Fluid | Follow the Manufacturer's Instructions for the mixture ratio. Automotive windshield washer fluid that meets regional freeze protection requirements. | S | ||
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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.