2008 Chrysler Aspen Owner Manual - Page 395
2008 Chrysler Aspen Manual
Page 395 highlights
394 MAINTAINING YOUR VEHICLE Spark Plugs Spark plugs must fire properly to assure proper engine performance and emission control. The plugs installed in your vehicle should operate satisfactorily in normal service for the mileage indicated in the Maintenance Chart. New plugs should be installed at this mileage. The entire set should be replaced if there is any malfunction due to a faulty spark plug. For the proper type of spark plug for your vehicle, refer to "Spark Plugs" under Fluids, Lubricants and Genuine Parts" in this section. Engine Air Cleaner Filter Follow the Maintenance Schedule for recommended engine air cleaner filter change intervals. WARNING! The air cleaner can provide a measure of protection in the case of engine backfire. Do not remove the air cleaner unless such removal is necessary for repair or maintenance. Make sure that no one is near the engine compartment before starting the vehicle with the air cleaner removed. Failure to do so can result in serious personal injury. CAUTION! When replacing plugs, do not overtighten. You could damage them and cause them to leak.
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