1、Improved design and PTFE seals kit, practical to use. 2、Made of premium material, with precise and professional manufacturing, which has long service life, sturdy to use. 3、If you drive a 6 cylinder vehicle 1993-2006 your Vanos (variable valve timing unit) is most likely failing. The O-rings fitted to the pistons within the Vanos unit wear prematurely because they are constructed of poor quality rubber which is not suited to the elevated temperatures of their location. The seals fail and lead to Vanos unit failure. Your car do not provide replacement seals, they do provide complete Vanos units at vast expense but these again are fitted with the same poor quality seals that will fail again. 4、The VANOS is version of variable valve timing. It advances or retards the intake and exhaust cams to pull more power out of the engine. It works by using oil pressure to move two pistons in or out and those pistons have o-ring seals in them. The OEM seals were made of buna rubber and they degraded over time. The replacement seals are made fluororubber and shouldn't have the same problem. 5、By installing our improved design seals and PTFE rings you will restore your Vanos unit to full health. Our seals are specifically designed for the environment in which they are fitted, well suited to the vast temperature range of the Vanos unit, constructed from improved materials designed to last. 6、Our seals and piston rings have undergone extensive testing and will not be aging over time like the OEM part, designed to last the lifetime of your vehicle. Item Type: Vanos Seals Material: Fluororubber, Aluminum Color: As picture shown Process: 304 stainless steel, Tig welded, CNC machined, polished Fitment: (Compatible with 6-cylinder engines M52TU, M56, and M54 1993-2006) Fits for 3 Series E46 1998-2005 Fits for 5 Series E39 1999-2003 Fits for 5 Series E60/E61 2002-2005 Fits for 7 Series E38 1998-2001 Fits for 7 Series E65/E66 2002-2005 Fits for Z3 E36 1998-2002 Fits for Z4 E85 2002-2005 Fits for X3 E83 2003-2006 Fits for X5 E53 2000-2006 Including: 4 x Replacement Seals and Wear Rings to Repair Both Pistons 2 x Improved Design and fluororubber Material O-rings for Piston Caps 1 x RTV Sealant for Resealing Valve Cover 9 x Replacement Bolts and Washers 1 x Vanos Repair Kit