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