It maybe important to note that the oil pump is gear driven, and (Should) run ONLY when the chain is moving, but if a gear is damaged the pump maybe not rotating. Further, I have seen video of oil suction tubes clogged w/ sawdust. TIP: Keep paint brush handy and always clean the area before removing oil/ fuel caps.
So here we are 5+ yrs later and the Husqvarna XP Oil WEBPAGE still does NOT give the ISO/ JASO rating? (BUT the Low Smoke still has it in the FIRST LINE.... sad marketing failure),