2007 Infiniti QX56 Owner's Manual - Page 308

SPARK PLUGS 1. Visually inspect the belt(s) for signs of unusual wear, cuts, fraying or looseness. If the belt is in poor condition or is loose, have it replaced or adjusted by an INFINITI dealer. 2. Have the belts checked regularly for condition and tension in accordance with the maintenance schedule found in your "INFINITI Service and Maintenance Guide". WARNING Be sure the engine and ignition switch are off and that the parking brake is engaged securely. CAUTION Be sure to use the correct socket to remove the spark plugs. An incorrect socket can damage the spark plugs. If replacement is required, see your INFINITI dealer for assistance. SDI1895 REPLACING SPARK PLUGS Platinum-tipped spark plugs It is not necessary to replace platinum-tipped A spark plugs as frequently as conventional type spark plugs because they last much longer. Follow the maintenance log in your "INFINITI Service and Maintenance Guide". Do not service platinum-tipped spark plugs by cleaning or regapping. ● Always replace spark plugs with recommended or equivalent ones. 8-16 Maintenance and do-it-yourself