2011 Chevrolet Express 1500 Cargo Owner's Manual - Page 303

Vehicle Care How to Check Lubricant What to Use Refer to Recommended Fluids and Lubricants on page 11‑8 to determine what kind of lubricant to use. 10-33 These standards apply only to vehicles sold in the United States. Federal law prohibits the following acts or the causing thereof: 1. The removal or rendering inoperative by any person, other than for purposes of maintenance, repair or replacement, of any device or element of design incorporated into any new vehicle for the purpose of noise control, prior to its sale or delivery to the ultimate purchaser or while it is in use; or 2. The use of the vehicle after such device or element of design has been removed or rendered inoperative by any person. Noise Control System The following information relates to compliance with federal noise emission standards for vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 4 536 kg (10,000 lbs). The Maintenance Schedule provides information on maintaining the noise control system to minimize degradation of the noise emission control system during the life of the vehicle. The noise control system warranty is given in the vehicle warranty booklet. To get an accurate reading, the vehicle should be on a level surface. If you have the 1500 Series, the proper level is from 15 mm (5/8 in) to 40 mm (1 5/8 in) below the bottom of the fill plug hole. The proper level for the 2500 and 3500 Series is from 0 to 6 mm (1/4 in) below the bottom of the fill plug hole. Add only enough fluid to reach the proper level.