I was running Amsoil 10w40 full synth until I could get Kendall 10W40 Mineral. Kendall is the most amazing oil I have ever used. It has a very high temp rating so there is no risk of it thinning out in the turbo. Used it in every race bike I have ever run and it is amazing. It basically stops any engine wear to the point where you cannot use it to run in a engine.
BTW Amsoil is awesome oil, just look at some of the off shore powerboats running Amsoil... Insanity