Originally Posted by n4zou

TC-W3 2 cycle engine oil is designed to be environmentally friendly when used in a properly designed 2 cycle engine. Combustion is near 100% so pollutants emitted are very low. So low in fact the EPA has granted import certification for those little Chinese bicycle engines. They had been banned from importation for 2006 and 2007 but with a new tuned exhaust system and the use of TC-W3 oil those little engines passed strict EPA requirements. I purchased a Chinese bicycle engine in 2005 and wore out the first bicycle I installed it on. I built another bicycle just for that engine. I'm very happy with it. It does not smoke or smell and the stock exhaust is very quiet. Here is a picture of my motorbike.