MicronAir Carbon Cabin Air Filter, fits Lincoln LS 2003-2006 requires 1 filter, and Jaguar S-Type 2003-2008 requires 1 filter. Offers the same filtration as the particle filter plus the added protection of carbon for odors and smells. Traps Harmful pollutants before they reach your vehicle's interior and provides cleaner air for allergy and asthma sufferers. Vehicle manufacturer recommends filter be changed every 6 to 12 months.