Keystone Chemical

About Keystone Chemical & the Johnsen's Brand

Keystone Chemical markets products under the well-known Johnsen's label, manufactured by Technical Chemical Company out of Cleburne, Texas. Johnsen's has been a recognized name in the automotive aftermarket car care industry since 1928, building decades of trust among professional mechanics and everyday drivers alike.

What began as a brake fluid packaging operation has grown into a comprehensive lineup of automotive chemicals designed to keep vehicles running at their best. Today, the brand offers a complete range of automotive fluids, aerosol products, and performance treatments that address virtually every fluid system in a modern vehicle. Rigorous quality control testing is a hallmark of the Johnsen's production process, ensuring that each product delivers consistent results and dependable performance.

A Legacy of Automotive Chemistry

Johnsen's long history in the industry means the brand has adapted alongside the evolving needs of the automotive aftermarket — from classic carbureted engines to today's fuel-injected, computer-managed powertrains. The product lineup has expanded over the decades to include brake cleaners, brake fluids, carburetor cleaners, power steering fluids, radiator products, lubricants, refrigerants, and a broad suite of fuel and oil additives.

The brand's global presence reflects its commitment to quality — not just for American consumers, but for drivers and service professionals around the world. Whether you're a professional shop stocking essential chemicals or a home mechanic looking for reliable treatments, Johnsen's products are formulated to deliver real results.

Fuel Additives You Can Count On

Among the most popular offerings in the Keystone Chemical / Johnsen's lineup are their fuel additives. Modern fuels — especially those blended with ethanol — can introduce moisture, corrosion, and instability into fuel systems over time. Johnsen's fuel treatments are engineered to counteract these issues, helping protect injectors, carburetors, and fuel lines from buildup and degradation. Products like their ethanol fuel treatment and stabilizer are formulated to prevent phase separation, remove moisture, and stabilize fuel during storage. Their starting fluid lineup complies with federal low-sulfur content requirements, making them suitable for use in diesel motor vehicles and non-road engines alike.

From octane boosters and fuel injector cleaners to mileage improvers and fuel stabilizers, Johnsen's brings a science-backed approach to fuel system care — backed by a quality assurance process that has been refined over nearly a century in the industry.