Gasoline Performance Standard
This document describes the deposit control performance of an unleaded gasoline at the retail level that minimizes deposits on fuel injectors, intake valves, and combustion chambers.
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