The quality and service mandatory requirements of Tenneco for its suppliers is clearly shown in the "Tenneco European Supplier Quality Procedure Manual". Refer to

Key measures used by Tenneco to measure the ongoing quality performance of its suppliers include PPM and on time delivery. All suppliers must be able to demonstrate their capability to meet these stringent quality requirements in a consistent manner; failure to do this will result in a Supplier performance review programme with Tenneco Supply Chain Management.