Engine Oil - Gasoline Engine

Engine oil with the American Petroleum Institute Certified for Gasoline Engines starburst symbol of the proper viscosity. To determine the preferred viscosity for vehicle's engine, see "Engine Oil" in the Index.

Engine Oil - Caterpillar Diesel Engine

See the Caterpillar® Operation & Maintenance Manual for engine oil recommendations.

Engine Coolant - GM Gasoline Engine

50/50 mixture of clean, drinkable water and use only GM Goodwrench® DEX-COOL® or Havoline®DEX-COOL® Coolant. See "Engine Coolant" in the Index.

Engine Coolant - Caterpillar Diesel Engine

See the Caterpillar® Operation & Maintenance Manual for engine coolant recommendations.

Hydraulic Brake System

Delco Supreme II® Brake Fluid - GM P/N 12377967, Canadian P/N 992667 or equivalent DOT-3 brake fluid

Windshield Washer Solvent

GM Optikleen® Washer Solvent - GM P/N 1051515, Canadian P/N 993033 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 993037 or equivalent or NLGI #3 consistency

Spring Parking Brake Hydraulic Pump

DEXRON® III Automatic Transmission Fluid

Brake Caliper Housing, Caliper Support Spring and Caliper

Aeroshell #5 Grease - GM P/N 12377969, Canadian P/N 10953439 or equivalent

Power Steering System

GM Power Steering Fluid - GM P/N 1052884 - 1 pint, 1050017 - 1 quart, Canadian P/N 993294 - 1 pint, 992646 - 1 quart or equivalent

Manual Transmission

Synthetic Manual Transmission Fluid - GM P/N 12345724, Canadian P/N 10953510 is the recommended lubricant to use.

Automatic Transmission

See the Allison Transmission Operator's Manual for correct transmission fluid.

Chassis Lubrication

Chassis Lubricant - GM P/N 12377985 or equivalent - or lubricant meeting requirements of NLGI #2, Category LB or GC-LB

Wheel Bearing Grease

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 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

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