FordPartsGiant.com offers the wholesale prices for genuine 2005 Mercury Monterey parts. Parts like Oil Pan & Oil Level Indicator are shipped directly from authorized Ford dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.9L OHV EFI NA, 6 Cyl 4.2L OHV EFI. Transmission: 4AT AX4N.