I've got a few hours on a Husqvarna 8527SBE (8.5Hp Tec L-head).   Ever since I changed the oil (2 hour break-in) I see that after using the blower, there is some oil on the left side of the chassis.   The oil is undoubtedly coming from the crankcase tube and is not a lot (maybe 1 square inch of oily stuff).    
I used the recommended viscosity of oil, and I have not over filled it.  Since changing it, the oil level has been halfway between "add" and "full" on the dipstick when screwed in.  
Should I be concerned, or is this normal?