Engine oil

[Simon.Pieman]

Simon.Pieman/VNA: I have used car oil (and not the cheapest) in bikes and regretted it… not that the engine actually broke as a result, but power gradually dropped off as the cam lobes suffered excessive wear.

Castrol GTX (white can) is not strictly a car oil, it was advertised in bike magazines and MCN for many years as the stuff to put in your bike.
As for cam wear, how do you know it was the oil? many many bikes have suffered endemic cam lobe wear which is usually a hardening issue. I had a GPz900 in the eighties and almost the entire production run of the first model had premature camlobe wear for example.