One of the biggest challenges facing fleet managers is how to manage the total cost of ownership (TCO) for existing heavy-duty diesel vehicles as legislation drives stricter emissions control in our towns and cities.
With Europe moving towards a phased compliance for Euro VII emissions standards in 2028-2029, it leaves managers of HGVs and public service vehicles with the headache of how to minimise operating costs, fleet asset values, and profitability. While there is a move towards electric vehicles, many plan replacement cycles over a decade in advance and the decisions made now will affect whether their existing diesel vehicles will remain compliant, operational, and financially viable beyond 2030.
It’s not all about electrifying as quickly as possible, the real winners will come from those who manage the total cost of ownership across their existing diesel fleet while transitioning to electric or other zero emission options.
Keeping diesel compliant
For diesel vehicles the total cost of ownership is increasingly driven by compliance risk and aftertreatment maintenance in addition to fuel costs and servicing.
The new Euro VII standards have moved emissions compliance from a one off type approval test to lifecycle monitoring. It means that a vehicle running a degraded DPF two years into a service could be no longer compliant resulting in lost revenue.
For vehicles that you are not replacing in the next couple of years, you need to run them at the lowest cost while keeping them compliant and on the road. It means that you must treat the DOC (Diesel Oxidation Catalysts), DPF (Diesel Particulate Filter), and SCR (Selective Catalytic Reduction) system as an integrated unit. A degraded DOC undermines DPF regeneration, and a clogged DPF shortens the life of the downstream SCR catalyst.
DPF remanufacturing
The single most effective measure is to move away from reactive DPF replacement when there is a fault to a scheduled exchange programme. You should collect filters as part of a preplanned cycle and swap them for cleaned or remanufactured units.
This delivers three benefits to help you manage your costs:
- Remanufacturing a DPF costs much less than fitting a new one, so it helps protect margins on those vehicles that you know have a known finite service life.
- A properly restored filter that is verified to 95% + of its original OEM performance will reduce exhaust back pressure to cut fuel consumption and the frequency of active regeneration cycles.
- It changes an unpredictable cost that includes unplanned downtime, roadside failure, and a compliance breech, into a budgeted and planned service.
And there is an ESG argument as well. Remanufacturing DPFs avoids the high embodied carbon costs of producing new ceramic substrates. One study found that remanufactured DPF units carry 8.3 kg CO₂e against 126 kg CO₂e for new. That’s an emissions reduction that fleets can report alongside their EV rollout, rather than a sustainability story that only begins once the last diesel vehicle leaves the fleet.
Finding the right partner
When selecting a remanufacturing partner for planned maintenance, make sure that you demand evidence that the cleaned DPF is fit for purpose.
This should include:
- 100% flow/back pressure testing that is benchmarked against the OEM reference data
- Digital traceability through unique unit IDs
- Advanced inspection methods such as ultrasonic testing, thermal imaging, and endoscopy
Rigorous testing of repurposed filters will catch any faults that a visual check might miss. And yield rates really do matter. A filter that fails after cleaning will lead to further downtime and the cost of a replacement unit.
Not all DPF cleaning is the same and this will affect whether the restored filter is “like new” or merely appears serviceable.
Our patented Xpurge system, for example, fills the DPF’s cells with de-ionised water before driving a pulse of compressed air through the filter. The water forces the compressed air across the porous cell walls to remove soot and ash from the inlet channels rather than simply knocking loose surface deposits.
This method is 30% more effective than compressed air or other water-based systems on the market. It restores filters to as much as 99% of their original OEM performance.
For an efficient exchange programme, you also need a big enough partner that operates locally. Ceramex has the capability to process tens of thousands of DPFs annually and has facilities in the UK, Europe, and India with joint ventures in North America and Japan.
Managing the gap
It pays to consider the total cost of ownership separately for diesel and electric vehicles. The reality is that most operators cannot afford to replace their entire fleet in one go, even if they could doubts remain about available charging infrastructure and the range of current electric models.
A better answer is to keep the diesel fleet compliant and efficient through scheduled, verifiable after treatment maintenance instead of a costly reactive alternative.
If you adopt such a strategy, you can use the savings from running your diesel fleet more cost effectively and for longer to help fund a gradual transition to electric or other zero emission vehicles.
You should not see your fleet as electric vs diesel but a well-managed whole that will contribute to a cleaner environment both now and in the future. Such an approach will help you avoid a panicked and large capital investment in the future.
