Be wary of DPF additive overdosing

Posted on May 2nd, 2019 by Rob Marshall

Be wary of DPF additive overdosing

We have heard recently of problems occurring, when drivers dose additives into their diesel cars to help clear a partially-blocked diesel particulate filter (DPF), as pictured. Subsequent problems occur not due to the additive itself but because the operator does not follow the instructions.


DPF additive problems

The additives work by promoting higher temperatures within the DPF. This makes it easier for the soot to burn. However, the supplied instructions tend to state that the additive should be added to a full tank of fuel. By ignoring this simple requirement, the additive/fuel concentration is higher and this promotes even greater temperatures within the filter.


This is not recommended for two reasons. Firstly, the filter’s internal structure can melt, rendering the unit useless. More seriously, the DPF’s exterior might dissolve, causing red-hot particles to fall out, which can result in a vehicle fire.


Therefore, should you choose to use a DPF fuel additive, pay extra attention to the dosing instructions. More additive is definitely not better in this case.