Gasoline Performance Standard

The TOP TIER™ Detergent Gasoline Performance Standard describes the test methods used and the performance requirements that retail unleaded gasoline must meet to be licensed as TOP TIER™.  Additive Companies conduct the testing on a given additive package and submit the results in order for the additive to obtain approval for use in TOP TIER™ Detergent Gasoline products. The fuel's impact on engine performance is measured via:

  • Intake valve and combustion chamber deposits from fuel additized at the TOP TIER™ treat rate in comparison to base fuel containing no additive using ASTM D6201.
  • Valve sticking tendency of the test fuel with a high level of the TOP TIER™ Detergent Gasoline using either the 1.9 L Volkswagen engine (Wasserboxer according to CEC F-16-T-96) or the 5.0 L 1990-95 General Motors V-8 engine (Southwest Research Institute IVS test).

For more details download the TOP TIER GASOLINE PERFORMANCE STANDARD