Redex DPF Cleaner starts working almost instantly as you drive, helping the car's system perform a regeneration (soot burn-off) at lower temperatures; you might see the warning light clear within a few minutes of driving, though significant blockages could take a tank of fuel or up to a week of normal driving to fully clear, as the cleaner aids the natural cleaning process, says the Amazon.com.au page for the product and a Reddit post on r/Renault.
You can use Redex DPF Cleaner either when the warning light comes on to clear the blockage, or during normal driving to prevent problems occurring. It's easy to use- simply pour into your fuel tank.
How long does a DPF regen take? Whilst this varies depending on the condition of the DPF, an active (manual) regeneration at a service garage can take between 1 and 2 hours. Or when driving, a passive regeneration will take only 10 to 15 minutes.
You will know whether active regeneration is taking place by the following symptoms:
Redex Petrol System Cleaner gets to work instantly, working its way through the fuel system to remove dirt and deposits from the injectors.
Redex Diesel System Cleaner is safe to use on all makes and models of diesel cars. It's guaranteed not to damage your car's internal components, and even if you add too much, there will be no harmful or long-lasting effects.
The reason for this is that the DPF can only burn off the build-up of soot and regenerate during long periods of high-speed driving. That being said, using a diesel fuel additive with a DPF cleaner can allow the DPF to be cleaned, even at lower speeds.
You should consult the handbook for your vehicle for more specific guidance on how you should drive to initiate regeneration of the DPF and clear the warning light. Nevertheless, a general rule of thumb to follow is that you should run the engine at least 40 mph and at least 2500 rpm.
8 symptoms of blocked DPF
If your car has an automatic gearbox, change gears in manual mode, increasing the number of revolutions. However, there's no need to go as far as the rev limiter, as that won't do any good. Drive in this mode for at least 30 minutes. This will trigger a regeneration cycle and your DPF will be cleaned.
Fuel additives are ideal for keeping a filter unclogged from the inside during use and can typically be poured into the filter without removal.
Keep It Steady: Keep the car in 4th or 5th gear and aim for around 2500 rpm. Avoid harsh acceleration and heavy braking. It's all about consistency! Drive On: The regeneration process typically takes about 30 minutes of continuous driving.
If a filter has been removed, the car should fail its MOT.
Can a blocked DPF clear itself? Yes, a mildly blocked DPF can clear itself through a process called passive regeneration, which occurs when the vehicle is driven at high speeds, allowing the exhaust temperature to burn off accumulated soot. However, if the DPF is heavily clogged, it may require manual intervention.
The top choice for DPF cleaning
JLM Diesel Particulate Filter Cleaner is among the best on the market. Used and trusted by professional technicians around the world it features a high concentration of active additives for superior cleaning performance.
The vehicle feels smoother when pulling away, and there appears to be a slight improvement in fuel economy. Results aren't dramatic, but given the low cost and ease of use, it offers good value as part of routine maintenance.
The Diesel Particulate Filter (DPF) traps soot and particulate matter from diesel exhaust to reduce harmful emissions. DPF clogging often results from short trips, idling, faulty sensors, poor fuel, or engine issues that prevent proper regeneration.
Top 10 vehicles with DPF issues:
Unusual Smells and Noises
Sometimes, you may hear a rattling or banging noise when you accelerate, possibly due to a damaged or broken filter. Immediately take your vehicle to a qualified technician if you notice unusual smells or noises.
Passive Regeneration
If you have mostly driven your diesel car around town and notice that the DPF is becoming blocked, take the car out on a long, motorway journey in an attempt to burn off the soot. On the motorway or dual carriageway, use a gear down (5-speed use 4th and 6-speed use 5th) to increase the engine revs.
A diagnostic tool is required to start the regeneration process, and the engine is run at a high idle to raise the exhaust temperature and burn off the soot.
What is classed as a short journey in a diesel? Put simply, a short journey in a diesel is one where the car's engine doesn't reach its proper operating temperature – typically around 90ºC. It varies depending on the car, but many diesels can take five miles or more to reach their operating temperature.
The simplest way to sort out a blocked DPF is to engage in 'passive regeneration'. Simply put, this is driving on a motorway or A-road at a sustained speed for 30-50 minutes to allow your exhaust temperature to reach the point where it can cleanly burn off the excess soot.
DPF Cleaning on any vehicle make or model from only £199* *Dependent on location & vehicle.