# 10 Proven Ways to Reduce Diesel Emissions and Pass Your MOT Test **Published: 27 August 2025** ## Introduction Diesel engines are strong and efficient, but they face strict emissions rules in the UK. Every year, the MOT test checks whether your vehicle meets legal exhaust standards. Failing this test could mean expensive repairs or not being allowed to drive. The good news is that there are reliable ways to cut diesel emissions, improve fuel efficiency, and keep your engine running longer. One practical solution is using **Sulnox Eco Fuel Conditioner**, which has shown proven results. ## What is the MOT Emissions Test? The MOT test measures harmful gases and smoke. Since 2018, emissions limits have become stricter. A missing or faulty diesel particulate filter (DPF) guarantees failure. ## Common Causes of High Diesel Emissions - Carbon build-up in injectors and fuel systems - Blocked or worn filters - Low-quality fuel - Faulty exhaust gas recirculation (EGR) valves - Ageing or poorly maintained engines ## 10 Ways to Reduce Diesel Emissions ### 1. Keep Up with Servicing Clean filters and injectors reduce emissions significantly. ### 2. Use Premium Diesel Higher quality fuel burns more cleanly. ### 3. Add Fuel Conditioners Additives such as **Sulnox Eco Fuel Conditioner** improve combustion and reduce smoke. ### 4. Change Engine Oil Regularly Fresh oil lowers friction and emissions. ### 5. Maintain the DPF A blocked or missing DPF results in MOT failure. ### 6. Service the SCR System Keep AdBlue topped up for NOx reduction. ### 7. Monitor Tyres & Driving Style Underinflated tyres and harsh driving increase fuel use. ### 8. Check the EGR Valve A clean, working EGR keeps emissions lower. ### 9. Take Longer Drives Motorway speeds help clear soot from the DPF. ### 10. Use a Pre-MOT Additive A conditioner before testing boosts chances of passing. ## Case Study: Sulnox in Action MGL Demolition tested Sulnox on four Scania trucks. Results showed: - **5.74% fuel savings on average** - **£173,000 annual savings** projected - **62,400 litres less fuel consumed** - Over **60% PM2.5 reduction** and **50% PM10 reduction** The trial proves Sulnox helps cut costs, emissions, and improves MOT compliance. ## Conclusion Lowering diesel emissions saves money, extends vehicle life, and protects the environment. From routine servicing to proven solutions like **Sulnox Eco Fuel Conditioner**, there are many steps drivers and fleet managers can take today. 👉 [Read the full article here](https://aands.international/10-proven-ways-to-reduce-diesel-emissions-and-pass-your-mot-test/) --- ## Contact Us **A&S International** The Old Brewery, 2 Brewery Court, High Street, Theale, RG7 5AH, United Kingdom Phone: +44 (0)118 930 4321 Email: hello@aands-international.com Website: [https://aands.international](https://aands.international) Google Maps: [View Location](https://maps.app.goo.gl/dMq4ABhuLddxw14g6)