Wynn's 18985 5L Off-Car Diesel Particulate Filter Cleaner Removes Soot & Deposits From DPFs

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The Used Car Guy holds no liability for your outcomes when trying the procedure listed above. This article is meant only to aid car owners that wish to avoid spending large amounts of money on their used car.

Using a DPF cleaning additive as a preventative measure could potentially save you thousands in repair bills. DPF’s have been fitted to comply with European emissions regulations and it is illegal to alter or remove the system.

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This will depend on the types of journey you do. If you drive on a motorway regularly for extended periods of time, you’ll need to use DPF cleaner less often than a typical “around town” driver. Part of Liqui Moly’s Pro Line of products, the German branded Liqui Moly DPF cleaner takes our top spot. Liqui Moly claim it’ll dissolve hardened, dense and encrusted contaminants on the surface of diesel particulate filters ensuring optimum performance at all times. As well as restoring performance of the engine, crucially, it’ll also improve fuel consumption significantly. Liqui Moly have built up an excellent reputation for producing exemplary car care products and this DPF cleaner is arguably one of their most impressive products yet. The key features of Liqui Moly Pro Line DPF cleaner are;

Over the last 10 years, air pollution has become a public health emergency and it is further alleged that particulate pollution is now responsible for around 50,000 avoidable deaths every year in the UK. DPF cleaners are suitable for most diesel or biodiesel engines and they may require regular usage to keep the DPF clean. However, if you find that they aren’t as effective as you would expect, go on a “spirited” drive whilst keeping the RPM’s high. You could also drive on the motorway and keep the car in a lower gear whilst travelling at 60 to 70 MPH. This type of driving along with using the cleaner should help to keep it clean as long as there isn’t a fault with the DPF. After using your DPF treatment head to the motorway and drive your vehicle at extremely high revs for at least 30 minutes. The car was running just fine, although it was drinking a lot of diesel. The only other symptom was a flashing glow plug light. If you have a manual car I suggest second gear and a speed of around 50 mph or you can try third gear at around 80 mph.Wait for five minutes before restarting your car to find that the DPF warning light, glow plug light or engine management light switched off! Since 2014, any diesel vehicle missing a diesel particulate filter will automatically fail its MOT. The Guardian newspaper revealed that thousands of drivers have been caught without a DPF fitted to their vehicles. In a press release from 2 May 2016, FOE air pollution campaigner, Oliver Hayes, stated, “Air pollution is a public health crisis of breath-taking proportions. The dodgy practice of removing pollution filters from cars is not only risking people’s health but also putting drivers at risk of prosecution for the simple fact that it’s illegal to drive a car with its DPF removed.”

In 2016 I bought a Vauxhall Zafira diesel automatic, with a DPF filter fitted as standard. As I was driving the car from Southampton to Bristol the engine glow plug light began flashing. Different cars will illuminate different warning lights as you can see in the image below. Wynn’s, the US based company, have developed an outstanding reputation over many years. They produce a whole host of engine performance additives and this DPF cleaner scores highly for value for money. Impressively, this DPF cleaner is also suitable for use in biodiesel vehicles all the way up to B30. The key features of Wynn’s DPF cleaner are; Update – October 2023– We have updated our product recommendations in line with some excellent new products that have been released in the UK market. Diesel particulate filters (DPF) are placed on the exhausts of diesel vehicles to prevent toxic emissions from flowing into the environment. Despite this, some motorists have the diesel filter removed to avoid mechanic failures and additional maintenance costs.The EGR valve (Exhaust Gas Recirculation Valve), sits in the engine bay and exhaust gasses flow through it before moving on through the DPF filter. Because diesel fuel is quite oily in it’s formulation, diesel cars often suffer from carbon build up in the engine. An EGR valve is a prime candidate for coking up with carbon and often results in reduced gas flow through the valve. Again, a common cause for EGR valve problems is frequent short journeys around town as opposed to motorway journeys.