Power Steering System

Electrohydraulic Power Steering Fluid (GM Part No. U.S. 88901975, in Canada 88901976).

Starter Generator Control Module (SGCM) Engine Coolant

50/50 mixture of clean, drinkable water and use only DEX-COOL® Coolant. See "Engine Coolant" in the owner manual.

Engine Oil

Engine oils with the letters CI-4 or CH-4 are best for your vehicle. The CI-4 or CH-4 designation may appear either alone, or in combination with other API designations, such as API CI-4/SL. These letters show American Petroleum Institute (API) levels of quality. GM Goodwrench® oil meets all the requirements for your vehicle. To determine the preferred viscosity for your vehicle's diesel engine, see Engine Oil .

Engine Coolant

50/50 mixture of clean, drinkable water and use only DEX-COOL® Coolant. See Engine Coolant .

Hydraulic Brake System

Delco® Supreme 11 Brake Fluid or equivalent DOT-3 brake fluid.

Windshield Washer

GM Optikleen Washer Solvent.

Van Models: Parking Brake Cable Guides

Chassis Lubricant (GM Part No. U.S. 12377985, in Canada 88901242) or lubricant meeting requirements of NLGI #2, Category LB or GC-LB.

Pickup Models: Hydraulic Clutch System (5-Speed Trans.)

Hydraulic Clutch Fluid (GM Part No. U.S. 12345347, in Canada 10953517) or equivalent DOT-3 brake fluid.

Pickup Models: Hydraulic Clutch System (6-Speed Trans.)

Hydraulic Clutch Fluid. Use only GM Part No. U.S. 88958860, in Canada 88901244, Super DOT-4 brake fluid.

Power Steering System

GM Power Steering Fluid (GM Part No. U.S. 89021184, in Canada 89021186).

Pickup Models: Manual Transmission (5-Speed with Low Gear, RPO MW3)

GM Goodwrench® Synthetic Manual Transmission Fluid (GM Part No. U.S. 12346190, in Canada 10953477) or equivalent SAE 75W-85 GL-4 gear oil.

Pickup Models: Manual Transmission (5-Speed without Low Gear, RPO MG5)

Synchromesh Transmission Fluid (GM Part No. U.S. 12345349, in Canada 10953465).

Pickup Models: Manual Transmission (6-Speed)

Synthetic Transmission Fluid approved to Allison Transmission® specification TES-295 (GM Part No. U.S. 12378515, in Canada 88900701).

Automatic Transmission

DEXRON®-VI Automatic Transmission Fluid.

Key Lock Cylinders

Multi-Purpose Lubricant, Superlube (GM Part No. U.S. 12346241, in Canada 10953474).

Pickup Models: Floor Shift Linkage

Lubriplate Lubricant Aerosol (GM Part No. U.S. 12346293, in Canada 992723) or lubricant meeting requirements of NLGI #2 Category LB or GC-LB.

Chassis Lubrication

Chassis Lubricant (GM Part No. U.S. 12377985, in Canada 88901242) or lubricant meeting requirements of NLGI #2, Category LB or GC-LB.

Van Models: Front Wheel Bearings

Wheel bearing lubricant meeting requirements of NLGI #2, Category GC or GC-LB (GM Part No. U.S. 1051344, in Canada 993037).

Van Models: Front and Rear Axle

SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 12378261, in Canada 10953455) or equivalent meeting GM Specification 9986115.

Pickup Models: Front Axle

SAE 80W-90 Axle Lubricant (GM Part No. U.S. 1052271, in Canada 10950849).

Pickup Models: Rear Axle

SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 12378261, in Canada 10953455) meeting GM Specification 9986115.

Pickup Models: Manual Transfer Case

DEXRON®-III Automatic Transmission Fluid. Look for "Approved for the H-Specification" on the label.

Pickup Models: Automatic Transfer Case

AUTO-TRAK II Fluid (GM Part No. U.S. 12378508, in Canada 10953626).

Van Models: Transfer Case

DEXRON®-III Automatic Transmission Fluid. Look for "Approved for the H-Specification" on the label.

Van Models: One-Piece Propshaft Slip Yoke Spline, Two-Piece Propshaft Slip-in-Tube Spline

Spline Lubricant, Special Lubricant (GM Part No. U.S. 12345879, in Canada 10953511) or lubricant meeting requirements of GM 9985830.

Pickup Models: Front Axle Propshaft Spline or One-Piece Propshaft Spline (Two-Wheel Drive with Auto. Trans.)

Spline Lubricant, Special Lubricant (GM Part No. U.S. 12345879, in Canada 10953511) or lubricant meeting requirements of GM 9985830.

Pickup Models: Rear Driveline Center Spline

Chassis Lubricant (GM Part No. U.S. 12377985, in Canada 88901242) or lubricant meeting requirements of NLGI #2, Category LB or GC-LB.

Hood Hinges

Multi-Purpose Lubricant, Superlube (GM Part No. U.S. 12346241, in Canada 10953474).

Pickup Models: Body Door Hinge Pins, Tailgate Hinge and Linkage, Folding Seats, and Fuel Door Hinge

Multi-Purpose Lubricant, Superlube (GM Part No. U.S. 12346241, in Canada 10953474).

Pickup Models: Tailgate Handle Pivot Points, Hinges, Latch Bolt, and Linkage

Multi-Purpose Lubricant, Superlube (GM Part No. U.S. 12346241, in Canada 10953474).

Weatherstrip Conditioning

Dielectric Silicone Grease (GM Part No. U.S. 12345579, in Canada 992887).

Weatherstrip Squeaks

Synthetic Grease with Teflon, Superlube (GM Part No. U.S. 12371287, in Canada 10953437).