Bardahl Diesel EGR Valve Cleaner Pack (1L + 300 ml Free) 868725668. Bardahl Diesel EGR Valve Cleaner SpecificationsPackaged in a 1L can with 300 ml free Bardahl EGR Valve Cleaner prevents the formation of deposits and restores air flow to the combustion chambers all without the need for dismantling. This additive for diesel engines also prevents over consumption of fuel and ensures perfect combustion guaranteeing optimum engine performance with no flat spots. This product is compatible with all engines low or high pressure with or without turbo fitted with catalytic converter and particulate filter. How to use: Pour the contents of the bottle into the tank then add 25 litres of fuel. With the engine warm run at a constant engine speed of between 2 500 and 3 000 rpm for 20 minutes. Repeat the operation 3 or 4 times depending on the degree of clogging until the treated fuel is used up in one or more trips. Refuel as normal.