What Happens When a Diesel Particulate Filter (DPF) Gets Clogged? Impact on Fuel Consumption
The Diesel Particulate Filter (DPF), which traps harmful soot and particulates emitted from the exhaust in diesel vehicles, protects the environment while playing a critical role in engine exhaust evacuation. Frequently clogged due to continuous short-distance city driving, this filter directly increases fuel consumption.
How Does a Clogged DPF Increase Fuel Consumption?
When exhaust gases cannot be discharged smoothly, back-pressure is created inside the engine. Pistons must expend more energy to push out the exhaust gas, which causes fuel consumption to rise.
Fuel Consumption During DPF Regeneration (Cleaning)
When the vehicle automatically initiates the process of burning off soot to clean the particulate filter (passive/active regeneration), it injects extra fuel into the exhaust to achieve the necessary temperature. During regeneration, instantaneous fuel consumption climbs noticeably.
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How to Prevent DPF Clogging?
- Take your vehicle out on the highway periodically (for example, once a month) and drive for 20–30 minutes at 2,500–3,000 RPM.
- Avoid using low-quality or uncertified fuel.
- Opt for DPF-approved (low-SAPS) engine oils.
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