Diesel All-In-One™ Fuel Conditioner is a diesel fuel additive that cleans the fuel system, pumps, and injectors while restoring power, plus much more. It's truly the Swiss Army knife of diesel fuel conditioner additives. It keeps your engine running smoothly and quietly, prevents corrosion, gum, and sediment deposits. It's anti-gel additive protects fuel in cold winter months. There's no question that today's low-sulfur diesel is better for the environment, but it comes at the cost of lubrication that your diesel engine needs, which is where a diesel additive can help.