SWEPCO 503 Premium Gasoline Improver


SWEPCO 503 Premium Gasoline Improver

Most modern engines have direct fuel injection into the combustion chamber for fuel economy and efficiency. In-between injections, the gasoline sits in a hot injector and will begin to form varnish and sludge. Current refining processes, biofuels and synthetic fuels have resulted in fuels that have low oxidation resistance, shortened storage life, and the tendency to form gum and varnish thus creating less power. Gasoline coming from the refineries have a minimal amount of additives present to fight oxidation, corrosion, and wear. Top Tier gasolines have additional additives to combat these issues and are generally higher priced at the pump. SWEPCO 503 Premium Gasoline Improver has the additional boost need to keep injectors clean and overcome the issues facing today’s fuels.

Some of the benefits that SWEPCO 503 provides are:

  • A strong detergent package to clean up fuel injectors, varnish, and sludge.
  • An EPA approved Octane booster that will increase the Octane rating by one point.
  • Promotes more complete combustion for more fuel economy and power.
  • Protects against harmful deposits, rust, and corrosion.
  • Prevents “Phase Inversion” in alcohol blends by keeping water in solution so it does not accumulate.
  • Can be used in pure gasoline, gasoline/ alcohol blends up to E-85, and synthetic fuels.
  • Works to prevent pre-ignition, knock, and pinging.
  • Keeps fuel fresh for longer periods of time to improve storage stability.
  • Easy to use, just add to bulk or on-board tanks prior to adding the fuel.
  • Will not harm exhaust treatment systems and catalytic converters.
  • Lubricates the upper cylinder to prevent wear.
  • Can be used in 2 and 4 cycle gasoline engines (except marine engines).
  • Effective in carbureted, port fuel injection or direct injection engines.


  • Fleets,
  • delivery vehicles,
  • lawn equipment,
  • agriculture,
  • personal vehicles,
  • municipalities,
  • Postal vehicles,
  • cab companies,
  • motor pools,
  • and generators.

NOTE: Not recommended for outboard or inboard engines on marine craft, boats, or recreational watercraft.

For more information regarding SWEPCO 503 Premium Gasoline Improver, please contact us.

Source: SWEPCO®

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