german castrol syntec, aka castrol slx, is the only oil certified for all 2005 model year sex machines.
i use the stuff in everything, car, computer fans, hinges, lawnmowers, firearms...that is, when i can get it. reduced consumption, slightly reduced noise in m50....see no reason not to try it yourself and see if you like it. the kinematic viscosity is on the heavy side of 30w, almost a 40 wt. its much heavier than mobil 1 30wts. bobistheoilguy has a whole forum about it, that's how much they like it.