Morning all.
I just love these oil debates, as they usually start some handbag flinging!
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The main problem when assessing an oils performance is that any shortcomings in an oils ability to prevent wear are often not apparent for several thousand miles. With most motorcycles covering a pretty paltry annual mileage, a lot of people assume that because they are using a cheap oil & have had no wear issues that the oil is up to the job.
My recommendation, unless you're fiscally challenged (skint) is to use a bike specific oil, & a semi-synthetic at least. In my opinion nowadays there's little difference in the quality of any bike specific oil from the major manufacturers.
As an ex courier who has been piddling around with motorbikes for in excess of 30 years, I would take any claim of telephone number mileages using spry crisp & dry as a lubricant with a giant pinch of salt. I worked with a guy who claimed that his ex plod R80 BMW had done over 500k. It turned out that he had 3 engines & 4 gearboxes that he would rebuild & rotate as necessary when the current incumbent was clapped out. Not quite the same as an engine that has done over 200k without a strip down eh.
He also had an incredible pile of cycle parts, such as forks, wheels etc, so the only original bit on his bike was probably the frame.
Cheers.