Hi bultacorock. Castrol Power 1 used to be called Castrol TTS which was Castrols first synthetic two stroke oil for motorcycles. It came out over here in the early eighties and it was great. I have been using Power 1 in my Sherpa 199B which has a 151 engine in it for the past six years and I have to clean the head, top of the piston and the exhaust port up once in that time. I just had my Sherpa rebored as it was still on the standard bore. It looks like it has been resleeved at some stage in its life as the ports had no chamfers on them which was making it rattle. So to answer your question Castrol Power 1 is fine and so is any good synthetic two stroke oil. The Castrol is supposed to have kerosene in it but it still works fine. Graham.