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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HOMESERVICE MANUALSGMC2020SIERRA 2500 HD AT4, 6.6L ENG VIN YREPAIR AND DIAGNOSISMAINTENANCEPROCEDURESMAINTENANCE AND LUBRICATIONSPECIFICATIONSFLUID AND LUBRICANT RECOMMENDATIONS
2020 GMC Sierra 2500 HD AT4, 6.6L Eng VIN Y
Fluid and Lubricant Recommendations
2020 GMC Sierra 2500 HD AT4, 6.6L Eng VIN YSECTION Fluid and Lubricant Recommendations
| Usage | Fluid/Lubricant |
|---|---|
| Automatic Transmission 6L90 (MYD) | Adhesives, Fluids, Lubricants, and Sealers |
| Automatic Transmission 10L1000 (MGM MGU) | Adhesives, Fluids, Lubricants, and Sealers |
| Bolted Exterior Body Panels and Closures | Adhesives, Fluids, Lubricants, and Sealers |
| Chassis Lubrication | Chassis Lubricant (GM Part No. 12377985, in Canada 88901242) or lubricant meeting requirements of NLGI #2, Category LB or GC-LB. |
| Diesel Exhaust Aftertreatment System | Diesel Exhaust Fluid (GM Part No. 19286291, in Canada 88865751) or Diesel Exhaust Fluid that meets ISO 22241-1 or displays the API Diesel Exhaust Fluid Certification Mark. |
| Disc Brakes | Adhesives, Fluids, Lubricants, and Sealers |
| Engine Heating and Cooling | Adhesives, Fluids, Lubricants, and Sealers |
| Engine Controls and Fuel - 6.6L (L5P) Diesel | Adhesives, Fluids, Lubricants, and Sealers |
| Engine Controls and Fuel - 6.6L (L8T) | Adhesives, Fluids, Lubricants, and Sealers |
| Engine Mechanical - 6.6L (L5P) Diesel | Adhesives, Fluids, Lubricants, and Sealers |
| Engine Mechanical - 6.6L (L8T) | Adhesives, Fluids, Lubricants, and Sealers |
| Floor Coverings and Headlinings | Adhesives, Fluids, Lubricants, and Sealers |
| Frame and Underbody | Adhesives, Fluids, Lubricants, and Sealers |
| Front Drive Axle | Adhesives, Fluids, Lubricants, and Sealers |
| Front Suspension | Adhesives, Fluids, Lubricants, and Sealers |
| Heating, Ventilation, and Air Conditioning | Adhesives, Fluids, Lubricants, and Sealers |
| Hydraulic Brake System | Adhesives, Fluids, Lubricants, and Sealers |
| Key Lock Cylinders, Hood Hinges, Body Door Hinge Pins, Tailgate Hinge and Linkage, Fuel Door Hinge, Tailgate Handle Pivot Points, Hinges, Latch Bolt, and Linkage | Multi-Purpose Lubricant, Superlube (GM Part No. 12346241, in Canada 10953474) |
| Power Steering | Adhesives, Fluids, Lubricants, and Sealers |
| Propeller Shaft | Adhesives, Fluids, Lubricants, and Sealers |
| Rear Drive Axle | Adhesives, Fluids, Lubricants, and Sealers |
| Steering Linkage | Adhesives, Fluids, Lubricants, and Sealers |
| Steering Wheel and Column | Adhesives, Fluids, Lubricants, and Sealers |
| Tires and Wheels | Adhesives, Fluids, Lubricants, and Sealers |
| Transfer Case - MP 1625/1626 (NQF) | Adhesives, Fluids, Lubricants, and Sealers |
| Transfer Case - MP 3023/3024 (NQH) | Adhesives, Fluids, Lubricants, and Sealers |
| Weatherstrip Conditioning | Weatherstrip Lubricant (GM Part No. 3634770, in Canada 10953518) or equivalent |
| Weatherstrip Squeaks | Synthetic Grease with Teflon, Superlube (GM Part No. 12371287, in Canada 10953437) |
| Windshield Washer | Optikleen Washer Solvent (GM Part No. 1051515, in Canada 10951147) |
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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.