2011 GMC Savana 1500 Cargo Owner's Manual - Page 302

10-36 Vehicle Care 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. Among those acts presumed to constitute tampering are the acts listed below. Insulation: . What to Use Refer to Recommended Fluids and Lubricants on page 11‑7 to determine what kind of lubricant to use. Removal of the noise shields or any underhood insulation. Removal or rendering engine speed governor, if the vehicle has one, inoperative so as to allow engine speed to exceed manufacturer specifications. Removal of fan clutch, if the vehicle has one, or rendering clutch inoperative. Removal of the fan shroud, if the vehicle has one. Removal of the air cleaner silencer. Modification of the air cleaner. Engine: . 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. These standards apply only to vehicles sold in the United States. Fan and Drive: . . Air Intake: . .