Why should you use a proper motorcycle oil in your pride and joy, surely all oil meets the spec anyway?

So often the terms ‘oil is oil’ and ‘it all meets the spec’ are bandied about in conversation, both actual and virtually. Forums are awash with opinions on oil and lubrication, motorcycle arenas are especially prone to this and it never ceases to amaze me the utter, misguided, bollox that passes for expert internet opinion in this area. So here is my opinion (and actually, I really am an oil expert!).
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