BMW X5: Emissions Management

The N54 and N52KP meet ULEV II requirements for 2007. There are not many changes to the emission systems on these engines. The N54 engine has 2 underbody catalysts in addition to the "near engine" catalysts already in use from the N52.

The N51 engine, however, is a SULEV II compliant engine which meets the 2007 requirements. In addition to the 5 existing SULEV states of California, New York, Maine, Massachusetts, and Vermont - four states have been added for 2007. These states include, Connecticut, Rhode Island, Oregon and Washington State.

The N51 emissions measures include:

• Secondary Air System with mini-HFM
• Radiator with "Prem-air" coating
• Lower compression ratio (10:1) via modified combustion chamber and pistons
• Underbody catalyst in addition to "near engine" catalyst
• Activated carbon air filter in air filter housing
• Steel fuel lines with threaded fittings and sealed fuel tank
• Crankcase ventilation system integrated into cylinder head cover
• Purge system piping made from optimized plastic

NOTE: The SULEV II information above is only preliminary and is accurate as of 8/06.

Additional information will be released as it becomes available.

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