Best DPF Cleaner

Best DPF Cleaner for Diesel Vehicle Maintenance

If you own a diesel vehicle, then you will definitely need to clean your DPF (Diesel Particulate Filter) at some point. Most diesel owners aren’t even aware their vehicle has a DPF and can be quite worried when the dreaded DPF light appears on their dashboard.

The best DPF cleaner we recommend here at Milner is the TEC4 Complete DPF & Diesel System Cleaning Kit for vehicles with DPF. It’s the perfect cost-effective solution for cleaning your DPF. This kit can easily either significantly improve fuel economy or fix an existing problem. Nb. This kit will only clean your DPF.

What is a Diesel Particulate Filter (DPF)?

The diesel particulate filter (DPF) is designed to remove diesel particulate matter or soot from exhaust gas produced by a diesel engine.

The DPF needs to be cleaned regularly, and this is done by a process called regeneration. The regeneration can be either active, passive or forced regeneration. Soot is burnt off at high temperature – approximately 600°c – leaving only a residue of ash. The reason for the regeneration is to allow it to take on more pollution from the diesel engine.

What to Look for In A DPF Cleaner

In our opinion, these are the most important things to look for:

  • Combats the adverse effects of stop-start driving
  • Lowers the temperature at which soot particles are burnt off
  • Aids passive regeneration of the DPF system
  • Improves engine performance and response
  • Compatible with all diesel engines
  • Reduces exhaust emissions

Tec4 DPF System Cleaner is simply added to the contents of the fuel tank. The product uses a catalyst to adhere to the soot particles produced during combustion thus lowering the temperature at which the soot particles can be burnt off.

This enables the system to regenerate at the lower temperatures typically associated with short journeys and stop-start driving.

Tec4 DPF System Cleaner is compatible with Diesel and Bio-Diesel.

Use only as directed in compression ignition engines.

Add one 400ml bottle of Tec4 DPF System Cleaner to the contents of the fuel tank.

For engines that have a fuel tank larger than 100-litre capacity add at 0.5% by volume.

Why Should You Clean Your DPF?

As we mentioned above, the DPF’s aim is to physically trap and collect diesel soot and ash particles. While the majority of trapped soot is burned off during periodic filter regeneration, ash particles are not burned off. Over time, the unburned ash particles and soot will plug the filter unless the filteris cleaned. Letting Soot and ash build up can lead to you needing a new DPF which can cost anywhere from a few hundred pounds to a few thousand pounds depending on your vehicles make.

The common benefits of regular DPF cleaning are:

  • Improve fuel economy
  • Improve overall engine performance
  • Prevent DPF failure and replacement expenses

Find out how to clean your DPF here.

DPF Blocked? What happens next?

When your DPF filter reaches approximately 45% blockage the filter will begin “active regeneration”. Once the blockage reaches this level, this will usually lead to the EGR (Exhaust Gas Recirculation) valve being closed. To begin the “active regeneration” the boost pressure from the turbo is increased slightly along with a slightly higher idle RPM. Diesel is then injected into the cylinders just after combustion so that it enters the Exhaust further heating up the DPF to around 600°c and clearing the soot from the filter.

DPFs tend to need replacement after a certain mileage has elapsed, the rate of which varies between 80,000 and 150,000 miles, dependent on the car make and model, the type of use and whether or not the engine has had regular oil changes with a lubricant that does not contain additives that block the filter. Instead of having a new DPF fitted, it is possible to have it cleaned.

Is it Illegal to remove the DPF?

Removing your car’s diesel particulate filter (DPF) might be tempting because the damage caused by a clogged DPF can result in four-figure repair bills. To meet or exceed European-dictated emissions standards, DPFs have been fitted to most diesel cars for almost a decade and, because they need high temperatures to regenerate, low mileage stop-start motoring can cause them to block. Should a fascia warning lamp be ignored, expensive engine damage can occur.

If a vehicle is fitted with a DPF and is then removed, it is illegal to drive that vehicle on the road. “It is an offence under the Road Vehicles (Construction and Use) Regulations to use a vehicle that has been modified in such a way that it no longer complies with the air pollutant emissions standards it was designed to meet.” Removal of a DPF will almost invariably contravene these requirements, making the vehicle illegal for road use.

Will DPF Removal Result in MOT Failure?

If you have your DPF filter removed or has been removed before you bought the vehicle, it will fail its MOT. There have been cases where people have bought a used diesel vehicle with 12 month’s MOT and failed it’s next MOT because, unbeknown to the new owner, the DPF had been removed.

However, if your vehicle was never originally fitted with a DPF, it will be logged in the VIN code and the MOT inspector will not look for one.

Please note: Milner Off Road are not liable for any damage you may cause to your vehicle(s) by following the instructions above. If you have not performed this procedure on your vehicle before, we highly advise you take your vehicle to a local mechanic.

4 Replies to “Best DPF Cleaner”

  1. Can you please tell me when Engine System fault comes up what does it mean, and also my Engine Management light has come on,I look forward to your replay. Many thanks from Mr Tannock.

    1. Hi Alistair,

      It’s hard to know what could be causing a fault light to come on without being able to take a look at it, however you can buy plug in fault code readers that can give you on screen diagnosis and even help you reset the light.

      Hope this helps,

  2. Can you please explain to me what should I use to clean dismantled DPF? I have added cleaners into the tank and It hasn’t worked. Above 100 km/h the car has difficulties with gaining a speed. I am looking forward to the response. Thanks

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