I used it for my 2 stroke dirt bike that was a 250 and never had any problems, than the store that was carrying it went out of business and I couldn't find it in my area anymore so I switched to amsoil interceptor(I think that's what it's called, it's the yellow cap amsoil). Probably still would be using the Lucas if I could, I'm pretty sure it was a synthetic or semi-synthetic and it was cheaper than amsoil.