Dee-Zol Concentrate Diesel Treatment

Complete Diesel Fuel Care

Dee-Zol Concentrate is a commercial-grade, all-purpose diesel fuel treatment formulated to improve fuel quality, restore engine performance, and protect diesel fuel systems from the most common fuel-related problems.

Originally introduced in 1954, Dee-Zol has been trusted by fleet operators, equipment owners, municipalities, and diesel professionals to keep engines running cleaner, more efficiently, and more reliably.

Suitable for all grades of diesel fuel, including ultra-low sulfur diesel (ULSD) and biodiesel blends up to B20.

Cleans and Restores Fuel System Performance

Dee-Zol Concentrate features advanced detergent technology that helps remove deposits from fuel injectors, combustion chambers, and other critical fuel system components.

Cleaner fuel systems promote improved fuel atomization, more complete combustion, smoother engine operation, and restored performance.

Improves Combustion and Fuel Quality

Its balanced formulation combines:

• Advanced fuel system detergents
• Cetane improver
• Water-control technology
• Lubricity improver
• Fuel stabilizer

Together, these technologies help improve combustion quality, maintain cleaner fuel systems, protect modern diesel fuel injection equipment, and preserve fuel quality during storage.

Protects Modern Diesel Fuel Systems

Today's diesel fuels present different challenges than earlier generations of diesel fuel. Dee-Zol Concentrate helps restore lubricity lost during ultra-low sulfur diesel (ULSD) production while also helping manage residual water and maintain stored fuel quality.

Regular use helps keep diesel fuel performing at its best while supporting long-term fuel system reliability.