Modern Engines Are More Sensitive to Soot Formation from “Dirty Fuel”

Today’s petrol and diesel engines operate very differently from older designs.

Most modern vehicles now rely on technologies such as:

• Gasoline Direct Injection (GDI)
• Turbocharging
• Advanced catalytic converters
• Petrol particulate filters (PPF)

Under certain conditions, direct-injection petrol engines can produce significantly more particulate matter than traditional port-fuel-injection engines.

These systems are designed to improve fuel efficiency, reduce vehicle emissions, and create cleaner air. At the same time, they make engines far more sensitive to changes in fuel quality, fuel delivery, and combustion conditions.

Direct injection systems deliver fuel directly into the combustion chamber rather than into the intake port. While this improves efficiency and power output, it also changes the combustion process. It does this by increasing the likelihood of incomplete combustion when dirty fuel or high-sulphur fuel is present. This can lead to higher particulate output and contribute to air pollution and smog creation.

Because of this, many newer vehicles rely on particulate filters to capture soot before it exits the exhaust system. This applies to both petrol engines (PPF) and diesel vehicles (DPF), underscoring how critical soot control is for reducing emissions and protecting human health.

A similar approach has long been used in diesel vehicles through Diesel Particulate Filters (DPF), which capture soot generated during diesel combustion. The widespread use of particulate filters across both petrol and diesel engines highlights how important it is to control soot formation in modern engine design.

When fuel quality standards are eased, even slightly, combustion efficiency can be affected. This may increase carbon formation and lead to:

Over time this may contribute to:

• Carbon deposits on fuel injectors
• Combustion chamber buildup
• Intake valve deposits
• Increased particulate emissions

Vehicles built in the past 10 to 15 years, particularly those with direct injection and turbocharged engines, are therefore more sensitive to combustion cleanliness than older petrol engines.

Why Fuel Standards Were Temporarily Adjusted

Australia recently moved toward cleaner fuel by introducing new fuel standards. This involved reducing sulphur levels to 10 parts per million (ppm) across all grades of unleaded petrol, including premium unleaded.

However, due to disruptions in the world’s oil supply, rising crude oil costs, and pressure on fuel prices and petrol prices, the government introduced a temporary change. In doing so, they relaxed these standards for only a short period to increase the available petrol supply.

This decision, supported by Energy Minister Chris Bowen, allows petrol with higher sulphur content (up to 50 ppm) to enter the domestic market for a short period. The key thing here is that eased fuel standards remain in place only temporarily to ensure sufficient fuel delivery, stabilise fuel costs, and prevent widespread shortages in the coming weeks.

Australia’s reliance on imported oil and refined fuel, much of it sourced from the Middle East and processed overseas, highlights the vulnerability of its domestic supply. Unlike many countries that maintain larger domestic fuel reserves, Australia relies heavily on imported fuel and has historically remained below the International Energy Agency’s 90-day stockholding benchmark.

Australia’s domestic refining capacity has also declined significantly over the past decade. Today, the country operates only two remaining oil refineries: Ampol’s Lytton refinery in Queensland and Viva Energy’s Geelong refinery in Victoria, with most refined fuel now sourced from overseas.

With limited refining capacity, much of Australia’s petrol is produced through external refining processes and then exported overseas before being re-imported.

This situation affects not only metro areas but also regional markets and rural markets, where supply disruptions can have a greater impact.

Why Combustion Cleanliness Matters

Soot formation begins during the combustion process itself. When fuel does not burn completely, it leaves behind carbon particles. These particles can build up inside the engine, particularly when fuel quality is poor or sulphur levels are high.

These deposits can gradually affect engine performance by:

• Disrupting fuel atomisation
• Reducing combustion efficiency
• Increasing particulate formation
• Placing additional load on emission control systems

Over time, this can lead to reduced fuel efficiency, increased vehicle emissions, and higher levels of greenhouse gas emissions. All of which impact greenhouse gas emissions targets globally.

Maintaining clean combustion conditions is therefore one of the most effective ways to improve air quality, reduce air pollution, and help ensure that cleaner air saves lives by lowering exposure to harmful exhaust compounds.

In situations where fuel quality fluctuates, even temporarily, technologies that help maintain clean combustion can provide an additional layer of protection for engine performance and emissions systems.

Avoiding Dirty Fuel problems with FTC Decarbonizer.

When dealing with dirty fuel or fluctuating fuel quality, proactive maintenance is a key area for protecting engine performance.

Easy–to–use decarbonization technologies, such as FTC Decarbonizer, are designed to help address one of the primary causes of soot formation: carbon accumulation within the combustion system.

By helping break down carbon deposits and supporting more efficient combustion, this additive can totally avoid many of the high–sulphur concerns drivers have:

• Reduced carbon buildup
• Cleaner injectors and combustion chambers
• Improved combustion efficiency
• Lower soot and particulate formation

These benefits help maintain performance across both petrol and diesel engines, especially in Australia, where fuel quality can vary due to global supply pressures.

For more information on FTC Decarbonizer can help your vehicle avoid high sulphur problems contact Cost Effective Maintenance PH 07 33766188