Engine oil

[VNA]

For the first 10.000 kilometers it is good to run the bike on semi-synth. Except for bikes that come with full synth from the factory (most new ones do).

I was of the understanding that most bikes come from the factory filed with a low spec mineral oil.  It aids bedding in and hence the usual 600 mile oil and filter change.

The late Kevin Ash on running in - http://www.ashonbikes.com/content/running 

Peter Brett in that article from Castrol oils;

Peter Brett says that they’ve discovered synthetic oils actually interfere with running in, for reasons which go beyond their low friction properties - there also seems to be a chemical process happening which hinders it. “Although you can treat an engine as fully run in after 500 miles, surface stabilisation continues for at least the first 5,000 miles of an engine’s life,” he says. “Synthetic oils actively prevent this from happening, and not simply by holding friction surfaces apart, although we still don’t know exactly why and how this happens. But there’s no doubt they inhibit the process itself. So the consequence of using a synthetic too early is your engine will never run in properly. I would even suggest waiting until 10,000 miles (16,000km) before using it in most engines subjected to normal use. Until then, you’re best to use an inexpensive but branded mineral oil.”