If you drive a modern diesel vehicle, you may have heard about the diesel particulate filter (DPF). This essential component is designed to capture harmful soot particles before they are released into the atmosphere, helping to reduce emissions and keep your vehicle compliant with environmental standards. However, to function properly, some DPF systems rely on a special substance known as a particle filter additive. But what is a particle filter additive, and why does it matter for your vehicle’s health and performance?
At DPF Experts, we specialise in everything related to diesel particulate filters. Below, we’ll explain exactly what this additive does, how it works, and why keeping your system topped up is so important.
Understanding the DPF System
Before diving into the additive itself, let’s quickly recap what the DPF does. A diesel particulate filter is fitted to the exhaust system of most modern diesel cars and vans. Its job is to trap soot (tiny carbon particles) produced during combustion. Over time, these particles accumulate inside the filter and need to be burned off in a process called regeneration.
Regeneration happens either passively—when the exhaust reaches high temperatures naturally—or actively, when the vehicle injects extra fuel to raise exhaust temperatures. If the DPF cannot regenerate properly, it can become blocked, leading to reduced performance, poor fuel economy, warning lights, and costly repairs.
What is a Particle Filter Additive?
A particle filter additive is a specially formulated liquid that helps the DPF regenerate more effectively. It is automatically injected into the fuel tank by your vehicle’s onboard system in very small quantities.
The additive works by lowering the temperature at which soot particles burn off inside the DPF. Normally, regeneration requires temperatures of around 600°C, but with an additive, soot can be burned away at just 450°C. This makes regeneration easier to achieve during everyday driving, even on short journeys where exhaust temperatures might not otherwise get high enough.
In other words, the additive acts as a catalyst, ensuring the filter stays cleaner for longer and reducing the risk of blockages.
Which Vehicles Use Particle Filter Additives?
Not all diesel vehicles use an additive-based DPF system. Many rely solely on high exhaust temperatures to complete regeneration. However, a number of manufacturers—including Peugeot, Citroën, Ford, Volvo, Mazda, and Jaguar Land Rover—have designed vehicles with an additive tank that must be topped up periodically.
If your vehicle uses one of these systems, you’ll usually see a dashboard warning light when the additive level is running low. Ignoring this can lead to regeneration problems and potential DPF failure.
Why Topping Up the Additive is Essential
Running out of particle filter additive can have serious consequences:
Blocked DPF: Without the additive, soot may not burn away properly, leading to filter clogging.
Warning Lights: The engine management system will detect low additive levels and trigger warning lights.
MOT Failure: A blocked or non-functioning DPF can result in an MOT failure in the UK.
Expensive Repairs: Replacing a diesel particulate filter can cost thousands of pounds—far more than topping up the additive.
Regular maintenance is always cheaper than repair. At DPF Experts, we check and top up particle filter additive levels as part of our professional DPF servicing packages, saving you time, stress, and money in the long run.
How Often Does the Additive Need Topping Up?
The frequency depends on your vehicle make, model, and driving habits. Generally, the additive reservoir needs refilling every 70,000 to 100,000 miles, but it’s always best to follow the manufacturer’s recommendations.
At DPF Experts, our technicians can quickly determine whether your vehicle requires a top-up and carry out the service using the correct additive for your system.
Professional DPF Additive Services with DPF Experts
If you’ve been asking yourself, “What is a particle filter additive?”, you now know it’s a crucial part of your diesel engine’s emission system. Keeping it topped up ensures your DPF regenerates effectively, prevents costly damage, and keeps your vehicle road-legal.
At DPF Experts, we specialise in:
DPF additive top-ups
DPF cleaning and regeneration services
Full diagnostic checks
Expert advice on keeping your diesel vehicle running smoothly
With years of experience and a reputation for excellence, our team ensures your DPF system is in safe hands. Whether you’ve seen a warning light, noticed performance issues, or simply want peace of mind, we’re here to help.
Final Thoughts
So, what is a particle filter additive? Simply put, it’s a vital liquid catalyst that helps your diesel particulate filter clean itself at lower temperatures, preventing blockages and costly repairs.
If your vehicle relies on this system, don’t wait for problems to arise—schedule a check or top-up with DPF Experts today. Our dedicated team makes DPF maintenance simple, affordable, and stress-free.
Contact DPF Experts now for professional DPF additive services and keep your diesel vehicle performing at its best.
