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Frequently Asked Question: Mercedes-Benz

What Type of Fuel Should I Use in My Mercedes-Benz?

2025 Mercedes-Benz EQE SUV exterior front side view

Choosing the right fuel plays a crucial role in maintaining the performance and longevity of a Mercedes-Benz. Every model is engineered with precision, requiring specific fuel to function at its best. Using the correct fuel ensures smooth acceleration, better fuel efficiency, and reduced emissions. Ignoring fuel recommendations can lead to costly repairs and diminished performance over time.  


Knowing what fuel to use in a Mercedes-Benz is essential for maintaining reliability. At Mercedes-Benz of Arrowhead in Peoria, AZ, learn which fuel is recommended and what happens if the wrong fuel is used.  

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Recommended Fuel for Mercedes-Benz Models  

For most gasoline-powered models, Mercedes-Benz recommends premium unleaded gasoline (91 octane or higher). High-performance engines require premium fuel to function properly and avoid internal damage.  


Premium fuel prevents engine knocking, a condition where the air-fuel mixture ignites incorrectly, causing vibrations and possible long-term damage. High-octane fuel ensures complete combustion, leading to better efficiency and smoother acceleration.  


Using premium fuel also helps maintain the fuel injectors and combustion chamber, preventing carbon buildup. Cleaner fuel helps optimize power output, keeping the driving experience smooth and responsive.  


Some Mercedes-Benz diesel models require ultra-low sulfur diesel (ULSD) to comply with emissions regulations. Using the right fuel type protects the engine and ensures compliance with manufacturer guidelines.  

2025 Mercedes-Benz EQE exterior front view
2025 Mercedes-Benz CLA Coupe exterior front view

Consequences of Using Lower-Octane Fuel  


Filling a Mercedes-Benz with lower-octane fuel can reduce performance and potentially cause engine issues. Regular gasoline ignites faster under pressure, causing improper combustion cycles and knocking or pinging sounds.  

 

Long-term use of low-quality fuel can result in:
 

  • Reduced horsepower and efficiency – The engine struggles to generate optimal power.  

  • Carbon buildup – Poor fuel quality leads to deposits on intake valves and fuel injectors.  

  • Voided warranty – Manufacturer recommendations must be followed to avoid warranty concerns.  

  • Increased engine wear – Higher stress on internal components leads to premature damage.  

Impact of Using the Wrong Fuel  

Accidentally filling a gasoline-powered model with diesel, or vice versa, can cause severe engine damage. Diesel engines require high compression, while gasoline engines rely on spark ignition. Using the wrong fuel can lead to engine misfires, clogged fuel lines, and costly repairs.  

If the wrong fuel is added, avoid starting the vehicle and contact a Mercedes-Benz service center immediately. Prompt action prevents internal damage and reduces repair costs.  

Can I Use Alternative Fuels in My Mercedes-Benz?  

Some drivers explore alternative fuels for their Mercedes-Benz, such as ethanol blends, synthetic fuels, or flex-fuel options. While ethanol-blended gasoline (E10) is generally safe, higher concentrations like E85 are not recommended for most models.  

Synthetic fuels, developed as cleaner alternatives, may work in modern engines but require manufacturer approval. Using unapproved fuels can lead to fuel system corrosion and voided warranties.  


Mercedes-Benz electric models, such as the EQ lineup, eliminate fuel concerns. These vehicles rely on battery-powered electric motors, offering an emission-free driving experience. Understanding fuel compatibility makes sure that every model runs efficiently and without risk.  

2025 Mercedes-Benz CLA Coupe exterior rear view

Schedule Mercedes-Benz Service for Fuel System Maintenance  

Routine fuel system maintenance makes sure that a Mercedes-Benz continues to deliver top-tier performance. Over time, deposits can build up in the fuel injectors, combustion chambers, and intake valves, leading to inefficiencies.  

Professional service includes fuel injector cleaning, engine diagnostics, and performance evaluations to maintain smooth operation. A well-maintained fuel system leads to better fuel economy, lower emissions, and enhanced driving dynamics.  


For expert fuel system maintenance, trust Mercedes-Benz of Arrowhead. Certified technicians use specialized tools and diagnostic software to keep every Mercedes-Benz in peak condition. 

Schedule a Service Appointment at Mercedes-Benz of Arrowhead Today!  

Keep your Mercedes-Benz running at its best with expert fuel system care. Book an appointment online or visit our service center today! 

2025 Mercedes-Benz EQE SUV exterior rear view
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