Tenneco Inc. (Tenneco) is a producer of emission control and ride control products and systems for light, commercial and specialty vehicle applications. The Company serves both original equipment vehicle manufacturers (OEMs) and the repair and replacement markets, or aftermarket, worldwide. The vehicle parts industry is generally separated into two categories: original equipment (OE) in which parts are sold directly for use by OEMs and commercial vehicle engine manufacturers; and aftermarket in which replacement parts are sold in varying quantities to wholesalers, retailers and installers. In the OE category, parts suppliers are generally divided into tiers Tier 1 suppliers that provide their products directly to OEMs, and Tier 2 or Tier 3 suppliers that sell their products principally to other suppliers for combination into the other suppliers' own product offerings.