Why Co‑op’s TOP TIER™ Approved Gasoline Gives You More in Every Tank

At Co‑op, we’re committed to delivering high‑quality fuel that keeps your engine running cleaner, stronger, and longer. That’s why we’re proud to offer TOP TIER™ Approved Gasoline—a standard developed by leading automotive and heavy‑duty manufacturers to meet the evolving demands of today’s engines.

What Is TOP TIER™ Fuel?

TOP TIER™ is a performance standard created by major automakers—including GM, Ford, Toyota, BMW, Honda, Mercedes‑Benz, and others—to ensure fuel delivers superior engine cleanliness and protection beyond minimum regulatory requirements. 

This enhanced fuel standard includes higher levels of detergent additives and prohibits harmful metallic components, helping engines stay clean and operate as designed.

Cleaner Engines, Better Performance

Studies consistently show that TOP TIER™ fuels keep engines dramatically cleaner compared to non‑TOP TIER™ fuels:

• A major AAA study found that engines running on non‑TOP TIER™ gas accumulated 19 times more carbon deposits compared to those using TOP TIER™ fuel. 

• Cleaner engines mean fewer performance issues such as rough idling, hesitation, valve sticking, and reduced fuel economy. 

These benefits aren’t limited to new engines. Even high‑mileage engines showed significant deposit removal after just 1,000 miles on TOP TIER™ fuel.

Protection You Can Count On

Using TOP TIER™ fuel helps protect your engine and emissions system by:

• Reducing carbon buildup, which improves drivability and reduces maintenance costs. 

• Preventing sticking valves and fouled spark plugs, issues commonly associated with lower-quality gasoline. 

• Avoiding metallic additives that can damage catalytic converters and oxygen sensors.