Question: what is 2t and 4t engine oil?
Answer: A 2T Oil is designed to lubricate the engine components, mix-up with the fuel completely, burn and go out in the exhaust. A 4T Oil is not designed to do so. As a result, when a 4T Oil is put into in a 2T Engine, it causes spark-plug fouling, exhaust port blockage, smoke emissions etc.