What is fuel shimmer?

Fuel shimmer, also known as fuel mottling, is a phenomenon that occurs when light reflects off the surface of a fuel tank, creating a shimmering effect. This can be caused by a variety of factors, including the quality and cleanliness of the fuel, the presence of additives, and the type of lighting in the area.

Fuel shimmer is more common in diesel fuels, particularly in colder temperatures or when the fuel is agitated. It is usually not a cause for concern, as it does not indicate any issues with the fuel itself. However, excessive shimmering may be a sign of water contamination or other problems with the fuel.

To reduce fuel shimmer, it is important to regularly monitor and maintain the fuel system, including proper storage and handling of fuel. Keeping fuel tanks clean and free of water and contaminants can help prevent shimmering and ensure the fuel is of good quality.