thanks Bob, I've been buying a Motul Synthetic 15w/50 oil from a bike shop close to me, but now I might look at the Mobil 1 as it gets a good rap from the test you supplied a link to.
I'm not sure there is such a big difference in price anyway but if there is, it looks like the Mobil 1 seems to have good test results and might get my vote.
cheers
staffo
