pppfffffft (the sound of a can of worms opening)

what brand/viscosity are you using now and why do you feel the need for change?
personally, i have had great success with basic pennzoil 10w30 & 10w40 mineral oil in all my acvws (stock motors with lots of city driving & long road trips, varied ambient temps with no over heating, plenty of power). imho, it should work fine in your application aswell.