COSMO - Valve Stem Seals control the lubrication of the valve stem as it slides in the valve guide and with design to provide a precise amount of lubrication at the interface between the valve stem and the valve guide. Excessive oil in this area can lead to higher hydrocarbon and particulate emissions, fouling exhaust after-treatment devices over time. This is not a concern with a COSMO - Valve Stem Seals. Too little oil contributes to stem and guide wear. Too much oil increases oil consumption and can cause a buildup of carbon, leading to valve seat damage, Engine Valve damage and early Engine Valve failure, as well as loss of engine performance and emission failures. COSMO- Valve Stem Seals ensure dependable performance and superior service life giving engine longer life and better fuel consumption. COSMO- Valve Stem Seals feature a conventional on-guide design to suit the geometry of traditional engines. COSMO- Valve Stem Seals are manufactured to international standards. Our manufacturing plants are fully equipped with advanced production technology and serve as regional centers of excellence. We manufacture Valve Guide Stem Seals for almost all applications and all types of internal combustion engines and material research is continuous to ensure materials are compatible with the latest industry oil specifications. COSMO’s new patented material technology combines the benefits of a high-port pressure design with a one-piece construction. The benefits are robust performance through steel reinforcement and lower cost using a reduced number. At COSMO, Every application uses custom designs and processes that best meets customer goals of cost, performance, and timing.