Which fuel should I use, Euro 98 (E5) or Euro 95 (E10)?
Since the introduction of E10 gasoline, we are increasingly asked whether it is suitable for our beloved 4-stroke mopeds. Which fuel should you use: Euro 98 or Euro 95? Our advice is to always use Euro 98. In this blog, we explain more about it.
What is E10 gasoline? E10 gasoline is a mixture of regular gasoline and 10% bio-ethanol. Bio-ethanol is a renewable fuel made from biomass such as corn or sugarcane. This mixture reduces carbon dioxide (CO2) emissions compared to traditional gasoline because the combustion of bio-ethanol produces less CO2. However, ethanol has various chemical properties that make it less suitable for older engines not designed to handle it.
The (negative) effects of E10 gasoline Our beloved 4-stroke mopeds are often not designed with ethanol-resistant materials. This can lead to various problems:
Degradation of rubber: Ethanol can degrade rubber and plastic, causing parts such as seals, hoses, and carburetor components to wear out faster. This can lead to fuel leaks.
Corrosion: Ethanol is hygroscopic, meaning it attracts moisture. This can lead to moisture buildup in the fuel tank and fuel lines. The moisture buildup can in turn cause corrosion (rust). Especially in older engines, where rust prevention measures are less advanced, this can become a major issue.
Fuel system issues: Ethanol can disrupt the operation of the fuel system. The increased oxygen content in E10 gasoline can lead to a leaner fuel mixture, causing problems like overheating, irregular idling, and power loss.
Clogging: When the moped is not used for an extended period, the fuel may evaporate/dry out and leave residue in the fuel system. A clogged carburetor can result in the moped no longer functioning.
How to keep your fuel system in good condition: For owners of 4-stroke mopeds, we recommend the following:
Use E5 Gasoline: Where possible, use E5 gasoline, which contains only 5% ethanol and is less harmful to older engines.
Regular Maintenance: Ensure regular maintenance of your moped. Replace old and worn parts sensitive to ethanol damage, and ensure the carburetor is properly adjusted.
Storage: When the moped is not used for an extended period, it is wise to empty the fuel system.
