The CVH engine is 20 odd year old. Tolerances in modern engine construction is far finer than it used to be and they can therefore run thiner oils. If you look at engines 30+ years old, many were designed to run 20W ....?

I am no pro on the matter and don't know all the techie stuff. I'm just forwarding on info that I have been told by people in the know.

Speak to 'Oilman' on this site and explain the spec of your engine, your type of driving style etc and he will recommend an oil suitable for you!"