Not trying to stir things up, but if folks are running Syn3 and this happening using HD oil then it IS an HD issue. Their motor, their oil, their oil pump = their problem.
There are many people on this site (and others) who also have other performance vehicles that DON'T run stock oil, stock filters, stock anything. You make performance mods and you make adjustments to your lubricants, fuel, tuning, oil/transmission coolers, etc. to achieve the desire performance. It comes with the territory. I am not saying it is right or just.
I understand that given the issues, people want to keep it as HD as possible, so when (not if) the failures occur, it can be laid on HD and we can hold them responsible. My point in asking about oil in the first place is similar to the water pump issue that some have experienced (HD coolant gums up the magnetic drive impeller, but better coolant alternatives have been identified). If there is a better fluids option for those of us who have NOT had the issue, then maybe we should talk about it.
So for anyone who has had the Stage 3 or 4 modification and NOT had a sumping issue (I know you are out there), do you run factory fluids or some alternative lubricants?