Re: 2 Cycle Oil
Most, if not all 2 cycle oils available today are rated TCW-3......it retrofits all engines, required on newer ones. I have a '94 up Merc service manual and TCW-II was the best available at the time of printing of that manual.
I use Syn and conventional oils and notice with syn's that my engine runs cleaner and smokes less.
Not sure if Merc premium plus oil is syn or not (they don't say) but highly suspect it is Pennzoil premium plus (stated to be syn), just in a black container with a Merc label. Those are the two oils I have settled on and use today and can't seem to tell the difference.
Mark