Two days ago, the Ministry of Investments, Trade, and Industry approved a request by the Ministry of Energy and Petroleum, guided by the National Standards Council, to temporarily waive the sulfur parameter to a maximum limit of 50mg/kg.
This applies to KS EAS 177:2025 (Automotive Gasoil) and KS EAS 158:2025 (Premium Motor Spirit), reverting to previous fuel standards for a period of six months.
The move has raised concern among motorists, particularly over the potential impact on vehicle maintenance. Higher sulphur content may accelerate engine wear, forcing drivers to service their vehicles more frequently.
For instance, vehicles previously serviced after 6,000 km may now require oil changes as early as 4,000 km to maintain optimal oil pH levels.
This shift is expected to significantly affect modern engines, especially Euro 6/VI models (2014–2026+), which rely on advanced emission control technologies such as Zeolite Selective Catalytic Reduction (SCR) and Diesel Particulate Filters (DPF). These systems are highly sensitive to sulphur levels.
Understanding the Change: 10ppm vs 50ppm Fuel
The key difference lies in sulphur content, which primarily affects emissions rather than basic engine function:
- 10ppm fuel: Lower emissions, cleaner for the environment
- 50ppm fuel: Higher emissions, but still within globally accepted limits
To better understand the implications, we spoke to automotive technician Kennedy Muriithi at POTENT Dynamics Autowerks Kiambu Road, Opposite Edenville.
Also Read: EPRA Reveals Petrol Stations and Sites Selling Contaminated Fuel
He explained that European fuel standards are based on ultra-low sulphur levels, designed to support modern, high-efficiency engines. Increased sulphur content lowers fuel quality and raises concerns among car owners.
Sulphur, a natural component of crude oil, remains in trace amounts even after refining. During combustion, it forms sulphuric acid a corrosive substance that can damage engine components and degrade engine oil.
“The danger begins after combustion. Sulphuric acid forms and can corrode metal parts and contaminate engine oil, reducing its effectiveness,” Muriithi noted.
Also Read: Govt Waives Fuel Standards with Immediate Effect
What Should Motorists Do?
To mitigate these effects, motorists are advised to:
- Use high-quality engine oil with strong additive packages
- Ensure oils contain detergents to neutralize sulphuric acid
- Opt for lubricants with corrosion inhibitors and antioxidants to protect engine components
While the temporary policy aims to address supply or regulatory challenges, its impact on vehicle longevity and environmental standards remains a growing concern among consumers and industry experts alike.
