Swepco 503 Premium Gasoline Improver

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SWEPCO 503 Premium Gasoline Improver 

A dirty fuel system causes poor fuel economy, poor performance and increased maintenance costs. SWEPCO 503 Premium Gasoline Improver eliminates these problems by keeping fuel injectors, pumps and other close tolerance components clean. Special chemistry dissolves and removes harmful gum, varnish & carbon deposits in fuel systems and upper cylinder areas. It also protects expensive fuel injectors, pumps and o-rings from wear and deterioration caused by today’s low–sulfur diesel fuel. Regular use keeps fuel systems in perfect operating condition. Especially recommended for all types of automobile & light truck fleets.


Description & Purpose SWEPCO 503 is a unique blend of specialized high-temperature-resistant solvents and highly effective rust and corrosion inhibitors. The carefully balanced solvent portion of the formulation is extremely effective for removal of all forms of harmful engine deposits as well as for prevention of their formation. SWEPCO 503 is highly effective for removal of gum and other residues which tend to form in fuel injectors, fuel tanks, fuel filters and fuel lines, inhibiting proper fuel delivery and robbing power.

Technical Data
  • One improver that can be used in a mixed fleet without possibility of misapplication
  • Cleaning capability improves compression, eliminates sticky valves, and reduces engine wear by dissolving harmful carbon, gum and other abrasive materials
  • Lubricates the upper cylinders
  • Increases fuel economy
  • Automotive
  • Agricultural
  • Heavy Construction
  • Trucking
  • High performance automotive repair shops
  • Mobile construction equipment
  • Over the road trucks
  • Fleet operations

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