How Excess Sulphur And Manganese Damage Vehicle Engines

Vehicle owners and fleet managers are dealing with a surge in mechanical issues linked to contaminated fuel. Recent laboratory tests and mechanic reports indicate that significant quantities of petrol and diesel sold at the pump contain chemical levels that exceed legal limits. The two primary culprits identified are sulphur and manganese.

Sulphur is a natural component of crude oil. While refineries attempt to remove it, some remains in the final product. When diesel with high sulphur content is burned, it creates sulphuric acid. This acid is highly corrosive to engine components. It attacks the cylinder liners and piston rings, which leads to a loss of compression and reduced power.

The damage often goes unnoticed until the engine begins to consume excessive oil. Over time, the acidic byproduct degrades the lubricating properties of engine oil. This requires more frequent oil changes to prevent total engine seizure. For heavy construction machinery and logistics trucks, this adds a massive burden to operational budgets.

Manganese is another additive causing severe headaches for the local automotive industry. It is often used as an octane booster in cheaper, lower-quality petrol. While it improves combustion, it leaves metallic deposits on spark plugs and internal sensors. These deposits interfere with the electrical signals required for smooth engine timing and fuel injection.

Modern vehicles are particularly vulnerable to these contaminants because of their sensitive emission control systems. The catalytic converter, which is designed to reduce harmful exhaust gases, can become completely clogged by manganese soot. Once a converter is blocked, the engine cannot breathe, often resulting in the vehicle entering a limp mode or failing to start.

Replacing a catalytic converter is an expensive undertaking, often costing hundreds of thousands of shillings for newer models. Many motorists find themselves replacing these parts repeatedly because the underlying issue of poor fuel quality remains unaddressed. The problem is not limited to older cars, as even showroom-fresh vehicles are susceptible to chemical erosion.

The Energy and Petroleum Regulatory Authority (EPRA) is tasked with monitoring the quality of fuel imported and distributed in Kenya. While the agency conducts regular tests at depots and retail stations, some substandard batches still reach the consumer. This usually happens through illegal fuel siphoning or the adulteration of petrol with kerosene.

Industry experts advise drivers to be wary of petrol stations offering prices significantly lower than the regulated maximum. Such outlets may be blending fuels to increase profit margins at the expense of engine health. Using fuel additives can sometimes help, but they cannot fully neutralise the effects of heavily contaminated fuel.

For the construction and transport sectors, the impact is felt through increased downtime. A machine stuck in the garage due to fuel-related injector failure is a machine that is not generating revenue. As Kenyan infrastructure projects expand, the demand for high-quality, reliable fuel has never been more critical for the lifespan of heavy equipment.