The QH App uses the very latest catalogue data and offers easy-to-use functionality to identify the right part and information for the job in hand. Automatic updates ensure those in the automotive trade have the latest information to hand. Quinton Hazell, TJ Filters and Ci Engine Management are part of the portfolio of products under the Tetrosyl Group. Tetrosyl are a leading manufacturer of chemicals and lubes and a major distributor of many leading brands. Tetrosyl is now the biggest independent oil blender in the UK as well as the largest car care manufacturer in Europe.