ST100 -Standar If you use unleaded gas, ethanol, propane, or CNG, your engine needs the original Ampco top cylinder lubricator! The Ampco top cylinder lubricator provides critical valve to seat lubrication, which is now absent from gasoline, and prevents sticking valves and detonation caused by carbon and combustion deposits. Compressed gas fuels contain NO LUBRICATING PROPERTIES! They burn clean and may be “environmentally friendly”, but they also burn hot, are corrosive, and can cause very premature valve failure. The only way to introduce lubricity to a compressed gas fuel system is with the Ampco top cylinder lubricator.