What causes ash in the Particulate Filter?
• Ash is incombustible material derived from the additive pack in the lube oil. All engines consume a small amount of oil as part of their normal operation. The oil is burned in the combustion chamber along with the fuel, and the resulting small amount of residual ash from the oil is trapped in the filter section of the aftertreatment system. During filter regeneration, the PM is oxidized and removed from the filter. However, ash from the lube oil cannot be oxidized and remains in the filter.
