Delo on Highway The Problem Delo on Highway The Problem
Emission control Emission control

The EATS trade-off

The latest category of heavy-duty engine oils were specifically designed to protect this latest generation of engines, but oil technology has not advanced far enough when it comes to optimizing and protecting the aftertreatment system, especially with regards to the diesel particulate filter (DPF). Consequently, fleet owners and operations managers have been forced to make a trade-off—one that requires more fuel.



How DPFs increase fuel consumption

fuel consumption fuel consumption

DPF regeneration cycles

Once enough soot and ash accumulate, the engine initiates a

process where extremely high temperatures burn off the

collected particles to regenerate the DPF. Regen cycles can be

passive or active and both require additional fuel to run,

decreasing fuel economy.

What's actually happening?

DPFs play a crucial role in cleaning diesel exhaust before it hits the tailpipe, reducing emissions of particulate matter (PM). As fuel burns, the DPF collects and stores up to 98% of incombustible particles in the form of ash and soot.

Ash clogging in the DPF

Soot burns off through regeneration, but ash remains in the DPF.

Engine lubricants contain metallic additives, such as anti-wear and

detergents, which clog the DPF and create backpressure. On top of

regeneration cycles, this backpressure puts additional strain on the

engine, causing a significant increase in fuel consumption.

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Watch the Effects of Ash Buildup

Ash can deeply harm your fleet’s engines

once it has clogged DPFs—with consequences

that appear in more ways than one.

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Fueling fleets

Whether you operate a large fleet, a small fleet or

something in between, effectively managing fuel costs is

crucial to your business’s profitability. DPF clogging due

to ash buildup causes more frequent regenerations and

backpressure, which increases fuel consumption. And

those numbers can add up quickly across your fleet.

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The DPF impact on
fuel economy

Take a deeper dive on how fuel efficiency is

negatively impacted by oil contaminant clogging

in DPFs.

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Diesel Particulate Filter Operation 

Learn how the DPF works, and what effect it has on fuel economy.



Man inspecting filter Man inspecting filter

Inspecting the DPF

See how the honeycomb filter collects and stores

ash and soot to prevent harmful emissions.


Clean air Clean air

Cleaner air and lower-ash

See how landmark legislation on air quality has

had a far-reaching impact on diesel engine

design, producing a need for lower-ash oils.

Truck fleet Truck fleet

Maintenance issues and
aftertreatment systems

Understand the causes related to ash clogging in

your DPFs and why you may be servicing them

more than OEM guidelines suggest.

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Clogged DPFs and the “Fuel


Is your engine burning fuel at a faster rate? It

may be because ash is clogging your DPF,

causing backpressure and forced regenerations.