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A DPF (Diesel Particulate Filter) is a device designed to remove diesel particulate matter or soot from the exhaust gas of a diesel engine. Wall-flow diesel particulate filters usually remove 85% or more of the soot. In addition to collecting the particulate, a method must exist to clean the filter. Wall-flow filters are designed to burn off the accumulated particulate at regular intervals, and this can be achieved through engine modifications such as in-cylinder post injections, throttling of the intake air, and using the EGR valve during overrun all to achieve 630degC at the DPF. Running the regeneration cycle too often, while keeping the back pressure in the exhaust system low will use extra fuel, with increased oil dilution, which will increases the chances of diesel engine runaway and engine damage. Regenerating infrequently runs the risk of blocking the DPF and also causing engine damage and/or uncontrolled regeneration and possible DPF failure.