One thing to consider in this day/age of "DRY" crankcases... where there is actually NO fuel in the crankcase to bring the oil up into the system... UNLIKE the CFi 4 systems.
The oil for these dry-case motors must not be very tenacious... it has to flow easily through the bearings inside of a dry warm case/rods/crank and then up into the transfer ports to lubricate the cylinders.
So the old guard of saying that Mineral based oils work best, may not be OK. I'm not saying that you have to use VES gold... but you should use a good oil that will have the correct properties to run in these very recently different engines.
I've noticed that my friends who run synth like Redline, VES G+ etc smoke more after a week of sitting than the guys that use older mineral based oils... I belive that this is because the mineral based oils will cling to the parts more than the synth and no "pool" in the bottom of the crankcase like many of the pricier synth oils do.
The new synthetic oils run off the parts easily.. so much so that they do not protect the engines during summer storage... or even a week on the trailer in the cold... that is why fogging a motor is even more important than ever.
I'm looking into this right now and hope to have a better report up here soon.
This "dry case" situation is true for the PRO RMK/RMK engines from 2011 to present... and for the E-Tek engines.