Usage | Fluid/Lubricant |
Engine Oil, Gasoline | Engine oil with the American Petroleum Institute Certified for Gasoline Engines starburst symbol of the proper viscosity |
Engine Oil (DURAMAX Diesel Engine) | Engine oil with the letters CI-4 or CH-4 is best for your vehicle. The CI-4 or CH-4 disignation may appear either alone or in combination with other API disignations, such as API CI-4/SL. These letters show American Petroleum Institute levels of quality. |
Engine Oil, Caterpillar Diesel Engine | See the Caterpillar® Operation and maintenance Manual for engine oil recommendations. |
Engine Coolant, Gasoline Engine & DURAMAX® Diesel | 50/50 mixture of clean, drinkable water and use only GM Goodwrench® DEX-COOL® or Havoline® DEX-COOL® Coolant |
Engine Coolant, Caterpillar Diesel Engine | See the Caterpillar® Operation and maintenance Manual for engine coolant recommendations. |
Hydraulic Brake System | Delco Supreme II® Brake Fluid or equivalent DOT-3 brake fluid |
Windshield Washer Solvent | GM Optikleen® Washer Solvent or equivalent |
Clutch Bearing Lubricant | Clutch Bearing Lubricant -- GM P/N 12378484 or equivalent NLGI #3 consistency |
Exhaust Brake Ball Joint Cap Lubricant | High-Temperature Grease -- GM P/N 1051344 (Canadian P/N 903037), or equivalent or NLGI #3 consistency |
Power Steering System | GM Power Steering Fluid -- GM P/N 1052884 (Canadian P/N 993294) or equivalent |
Power Steering System | DEXRON® III Automatic Transmission Fluid |
Manual Transmission, Except AF 6-Speed | Synthetic Manual Transmission Fluid -- GM P/N 12345724 (Canadian P/N 10953510) is the recommended lubricant to use. |
Manual Transmission, Except ZF 6-Speed | Synthetic Manual Transmission Fluid -- GM P/N 12345724 (Canadian P/N 10953510) is the recommended lubricant to use. |
Manual Transmission, ZF 6-Speed | TranSynd® Synthetic Transmission Fluid -- GM P/N 12378515 (Canadian P/N 88900701) |
Automatic Transmission | See the Allison Transmission Operator's Manual for correct transmission fluid. |
Chassis Lubrication | Chassis Lubricant GM P/N 12377985 (Canadian P/N 88901242) or equivalent or lubricant meeting requirements of NLGI #2, Category LB or GC-LB |
Front Wheel Bearing Grease, Except Oil Filled Hubs | Wheel bearing lubricant meeting requirements of NLGI #2, Category GC or GC-LB -- GM P/N 1051344 (Canadian P/N 993037) or equivalent |
Front Wheel Bearings with Oil Filled Hubs | SAE 75W-90 Synthetic Axle Lubricant for Medium Duty Trucks -- GM P/N 12345841 (Canadian P/N 10953512) or equivalent |
Rear Axle and Rear Hubs | SAE 75W-90 Synthetic Axle Lubricant for Medium Duty Trucks -- GM P/N 12345841 (Canadian P/N 10953512) or equivalent |
Rear Axle Shift Motor Lubricant | Refrigerant Oil -- GM P/N 5416939 (Canadian P/N 10953496) |
Propshafts and Splines | Wheel bearing lubricant meeting requirements of NLGI #2, Category GC or GC-LB -- GM P/N 1051344 (Canadian P/N 993037) or equivalent |
Cab -- Door Hinges and Latches | Multi-Purpose Lubricant, Superlube® -- GM P/N 12346241 (Canadian P/N 10953474) or equivalent |
Weatherstrip Conditioning | Dielectric Silicone Grease GM P/N 12345579 (Canadian P/N 1974984) or equivalent |
Weatherstrip Squeaks | Synthetic Grease with Teflon, Superlube® -- GM P/N 12371287 (Canadian P/N 10953437) or equivalent |