It its a common misconception that synthetic oils are "slipperier" than conventional oil. It is inherantly no slipperier than any quality dino oil. Synthetic oil is manufactured using a man-made base stock. Each and every molecule, unlike conventional oil, is identical in size and smaller than those found in dino oil. This in itself provides a much more even and complete lubrication film. Dino oil also has inherant impurities which are left in it after the refining process.
With synthetic oil, any weight/viscosity oil can be manufactured, resulting in oil weights tailored to suit any application.
Another myth is that synthetic oil will cause oil leaks. Not true. You may end up with some minor leakage (more of a weepage actually), where you did not using dino oil, this is due to the smaller molecules finding places to leak out that the larger molecules of dino oil wouldnt. So, while the synthetic did not cause the leak, it mearly "found" a place to leak out (6 of one, half a dozen of the other perhaps?). There are no solvents in synthetic oil that can eventually break down seals, gasket or o-rings.
This is the same reason that a tired engine may actually smoke once switching over to synthetic oil. The oil didnt cause the smoking as such to develop, it is the smaller molecules getting past worn rings, cylinders, valve guides, etc.
To provide further information, I have included this link, I think you will find it informative and beneficial.
ps: I should add that I have been using sythetic in my Wee since the 9,000km mark. I have used Mobil1, Amsoil and now Kawasaki synthetic (changes in brands were due to availability in my area and the fact that Amsoil jacked up there prices about 30-40% over this winter)