Mercedes GLE-Class Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) on Mercedes GLE-Class diesel models (such as GLE 350 d 4MATIC or GLE 350 CDI BT 4MATIC) is an anti-pollution device placed in the exhaust system, located after the catalytic converter and before the muffler. It traps up to 99% of fine soot particles produced by diesel combustion, which are harmful to health and the environment.

The exhaust gases pass through a ceramic structure inside the DPF, which contains microscopic channels that trap soot particles such as carbon, hydrocarbons, and sulfates. This forms a layer that enhances filtration but increases backpressure if not cleaned. The system uses both passive and active regeneration to clean the filter:

• Passive regeneration: At high exhaust temperatures (550-600°C) during highway driving, soot particles burn off into CO2 and water vapor.
• Active regeneration: Engine control injects fuel post-combustion to heat the filter and burn soot, triggered when backpressure rises, usually every 500-700 km. Additives may be used to lower regeneration temperature by 100°C.

Recent diesel models with OM 656 engines combine DPF with SCR technology using AdBlue to reduce nitrogen oxides (NOx) emissions alongside particulate matter.

DPFs are fitted mainly on diesel GLE models such as:

• GLE 350 d 4MATIC (C167, 249 hp, OM 656.929 engine)
• GLE 350 CDI BT 4MATIC (X166, 258 hp / 190 kW)

The DPF is integrated into the exhaust system after the catalytic converter on these vehicles.

Common problems include clogging, especially from city driving with frequent idling and low engine loads. Symptoms of DPF issues include:

• Loss of engine power
• Dashboard warning lights related to the exhaust or emissions
• High backpressure readings (for example, 291% filter fill rate before cleaning)

Mercedes uses a forced regeneration process via diagnostic tools injecting diesel into the exhaust to burn soot, which lasts about 5-15 minutes every 500-700 km.

To reduce DPF clogging and maintain performance, follow these recommendations:

• Use high-quality diesel fuel with proper additives.
• Avoid short urban trips and frequent idling.
• Regularly inspect the Exhaust Gas Recirculation (EGR) valve.

Cleaning methods include:

• Cleaning without removal: Using additives like Xenum DPF Cleaner combined with pressure sensor regeneration via diagnostic tools, effective in 5-15 minutes.
• Cleaning with removal: Mechanical or chemical cleaning after dismantling the DPF, procedures vary by model.
• Manual regeneration: Forcing a regeneration cycle using diagnostic tools, requiring a prolonged drive at high engine speeds.
• Replacement: Original new DPFs, such as those offered by Krosfou, are made with high-grade ceramics and stainless steel, ensuring optimal efficiency and durability.

Mercedes officially performs DPF regeneration by injecting diesel fuel post-combustion, creating high temperatures to burn soot. This process:

• Occurs automatically or can be triggered via diagnostic tools for forced regeneration.
• Usually lasts between 5 to 15 minutes every 500-700 kilometers.
• Can increase risk of oil contamination from soot burning in the cylinder; regular oil checks are recommended.

Forced regeneration requires authorized diagnostic equipment and must comply with Mercedes maintenance schedules.

While diesel GLEs use Diesel Particulate Filters (DPFs), petrol variants may occasionally have Gasoline Particulate Filters (GPFs). GPFs work similarly but regenerate almost in real-time thanks to higher exhaust temperatures typical of petrol engines. Diesel models often combine DPF with SCR technology using AdBlue to reduce both particulate matter and nitrogen oxides (NOx).

For replacement DPFs, choose new original parts engineered to meet or exceed manufacturer specifications and regulations. Krosfou offers high-performance new stainless steel DPFs certified for quality and durability, with 3 years warranty (limited to 100,000 km usage). Benefits include:

• Manufactured with advanced ceramic honeycomb coated with rare metals for superior filtration.
• Made in Europe with full compliance to the latest European emission standards.
• Ease of ordering direct-from-factory with fast delivery options.

Avoid refurbished or reconditioned parts, as they do not meet recommended quality or warranty requirements.