Throttle Muscle TM8763 - FX805 Full Synthetic Engine Treatment Oil Converter with PTFE 16 Oz Fully formulated synthetic base motor oil meets or exceeds GF5 requirements which help reduce emissions and maximize fuel economy! Contains unique support package that helps bond PTFE to the metal parts of the engine resulting in lower friction and lower wear on surfaces. Compatible with all types of motor oil and can be used in both gasoline or diesel engines.