Replace your old and dirty air filter with a Drop-In Air Filter for your 2007-2008 Jeep Grand Cherokee 3.0L CRD. Direct-replacement drop-in filters are manufactured with a paper filter media, and aftermarket filters are made with an oiled cotton-gauze, or synthetic dry filter media. Replace the factory air filter on your vehicle with a quality drop-in air filter from S&B Filters, AFE, K&N Engineering, and others at XDP. The air filter in your vehicle serves as the first line of protection against harmful airborne debris that can damage your engine. A drop-in air filter is named after the simple installation as it simply drops into the factory airbox in most applications.