Engine oil

[Slaninar]

I'd would suggest for new or low mileage bikes you avoid fully synthetic oil for a good while, as there is a small risk you polish the bores and end up with piston rings that won't scrub in.  (some may say that this is another internet myth - I dunno) 

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).