DPF Thermal Cleaning
Ash does not burn off in a regen. When a filter loads up with it, the answer is a proper thermal cleaning, not a four-figure replacement part.
Maintenance & Systems
Why regens stop working
Regeneration burns soot, but the incombustible ash left behind from engine oil stays in the filter and slowly steals its capacity. As ash packs the cells, regens come closer together, fuel economy drops and eventually the truck derates. That trajectory ends in one of two places: a cleaned filter or an expensive new one.
Thermal cleaning bakes the filter to loosen accumulated ash, then removes it from the cells and verifies flow. Done on schedule, it restores capacity and pushes filter replacement years down the road.
Measured, not guessed
We evaluate the filter before cleaning, check for cracked substrates and melted cells that make cleaning pointless, and measure flow after cleaning so you can see the difference. If a filter is damaged beyond saving, we tell you before you spend money cleaning it.
The process
DPF Thermal Cleaning: scope of work
- Removal and inspection of the DPF and gaskets
- Substrate check for cracks and melt damage
- Thermal bake and ash extraction
- Flow verification against baseline
- Reinstallation with new hardware as needed
- Aftertreatment fault reset and road test
Scheduled intervals
When Each Engine Wants Its Filter Cleaned
Ash service is an engine specification, not a chassis one, so the interval follows whatever is under the hood. These are the manufacturers' own published windows. Bring us the engine and we will tell you where yours sits.
| Engine | Ash service window |
|---|---|
| CumminsX15, ISX15 | Around 400,000 miles |
| CumminsB6.7, L9, medium duty | Around 200,000 miles |
| DetroitDD13, DD15, DD16 | Around 400,000 miles |
| PACCARMX-11, MX-13 | Around 400,000 miles |
| Volvo and MackD11, D13, MP7, MP8 | Around 350,000 miles |
| InternationalA26, MaxxForce | 200,000 to 300,000 miles |
| CaterpillarC13, C15 | Around 300,000 miles |
| Light dutyDuramax, Power Stroke, Cummins pickup | 120,000 to 150,000 miles |
Every one of these figures is published against a duty cycle, and yours is the thing that moves it. Stop-and-go drayage, heavy PTO work, high idle time and any oil consumption problem all load a filter with ash faster than the book assumes, sometimes by half. Your engine's own service manual is the authority; treat rising regen frequency as the real signal, because a filter tells you it is loading before a mileage figure does.
Typical 2 day turnaround on all scheduled DPF services. Booking the clean before the truck derates is what keeps it to two days: an emergency clean competes with whatever is already on the bench.
Questions we hear
Straight answers
How often should a DPF be cleaned?
It depends on duty cycle and oil consumption, but many manufacturers suggest evaluation in the low hundreds of thousands of miles, sooner for stop-and-go work. Increasing regen frequency is the practical signal that ash load is building.
Is cleaning really cheaper than replacing?
Substantially. A new OEM filter is one of the most expensive single parts on the exhaust side of a modern diesel. Cleaning restores a healthy filter for a fraction of that, which is why we always evaluate before quoting a replacement.
Can you fix what caused the filter to clog?
Yes, and we recommend it. Oil consumption, injector and EGR problems, and weak regens all load filters early. We diagnose the cause in the same visit so the cleaned filter lasts.
Keep looking
Related services
Regen Systems
Forced regens, stuck regens and the reasons behind them: sensors, EGR, injectors and duty cycle, diagnosed properly.
See this service SVC 02Exhaust
Heavy truck exhaust and aftertreatment plumbing: leaks, clamps, stacks and sensor bungs, fabricated in-house.
See this service SVC 03Full Diagnostic Services
Factory-level diagnostics across Class 6 to Class 8: read the data, test the circuit, fix the cause.
See this serviceWhere we serve
DPF Thermal Cleaning across Northeast Florida
One shop at 3190 W Beaver St in Jacksonville, with customers from every direction: