Mercedes GLS-Class Diesel Particulate Filter DPF X166 (2015-2019)

The Diesel Particulate Filter (DPF) in the Mercedes GLS-Class X166 diesel, especially models like the 350 d 4-MATIC with the OM642.826/864 engine, is a component in the exhaust system designed to capture and hold microscopic harmful particles from diesel exhaust gases. It requires periodic regeneration by burning off soot at high temperatures and generally should be replaced every 120,000 to 170,000 km to prevent failures.

Common symptoms indicating a defective DPF include:

• Increased fuel consumption
• Loss of engine power
• Illumination of the Check Engine light
• Abnormal differential pressure readings (e.g., values deviating from the ideal 40-60 mbar)
• Activation of limp mode, limiting turbo and vehicle performance

Diagnosing ash content in the filter via a Mercedes Xentry diagnostic tool can confirm the state of the DPF.

DPF regeneration can be done through:

• Passive regeneration: Driving at 60-80 km/h for 25-30 minutes to reach soot combustion temperature.
• Forced regeneration: Using diagnostic tools like VCDS, Launch, or Xentry to initiate cleaning, often combined with spraying DPF cleaner under pressure and test driving with strong acceleration.

It's also important to check and clean or replace the differential pressure sensor if its readings are stuck, as it affects regeneration efficiency.

Various aerosol and liquid DPF cleaners compatible with the OM642.826 engine are available, including:

• Valvoline Diesel DPF Cleaner (400 ml aerosol) – removes ash deposits
• CARTECHNIC DPF Cleaner (400 ml aerosol) – spray for catalytic converter type DPF
• MOTUL Diesel DPF Cleaner (300 ml liquid)
• Carsols DPF Cleaner (1 L bottle)
• BIZOL DPF-Regeneration+ d61 (250 ml) additive mixed with fuel

Using recommended cleaners helps extend DPF life and improves fuel efficiency and emission control.

Brand-new DPF units suitable for the GLS X166 350 d 4-MATIC (2015-2018 with 258 hp OM642.826/864 engine) are available with a 3-year warranty. These filters are manufactured with high-quality materials, comply with OEM standards, and weigh approximately 0.521 kg. Compatible replacement parts can be ordered to meet manufacturer specifications ensuring exhaust emission regulations are met.

The DPF is part of the vehicle’s exhaust system, positioned downstream of the engine’s catalytic converter. The differential pressure sensor related to the DPF is typically accessible after removing the airbox, secured by two T30 screws near the filter.

• Proper location ensures accurate emission control and soot filtration.
• Sensor maintenance is crucial for monitoring filter condition and regeneration.

Consult official manuals or diagnostics for precise sensor placement and part numbers.

DPF replacement is recommended roughly every 120,000 to 170,000 km to avoid engine issues related to clogging. Signs that replacement may be necessary include persistent high differential pressure above 26 mbar after regeneration, inability to clear soot deposits, or damage evidenced by diagnostic results.

• Failure to replace a clogged DPF can cause increased fuel consumption and power loss.
• Regular maintenance and avoiding short trips help extend DPF life.

Professional diagnostics with tools like Xentry is advised to confirm replacement needs.

Original high-performance DPFs made in Europe with OEM-level quality, stainless steel construction, and advanced monolith technology are available for the Mercedes GLS-Class X166. These products come with a 3-year warranty covering use up to 100,000 km provided installation is done by a professional and maintenance conditions are met.

• Certified by TÜV SÜD Automotive GmbH for superior quality.
• Ships internationally with tracking and reliable carriers.
• Free returns available within 30 days for unused original items in Europe.

Ordering directly from specialized suppliers ensures authentic parts, optimal engine performance, and compliance with emission standards.

For installation support or technical advice, contacting experts with Mercedes diagnostic tools is recommended.