Glen, if you don't have a Pro XS, the recommended oil has always been Mercury/Quicksilver DFI oil. If you have a Pro XS motor, the recommended oil was Premium Plus up until last month, at which time Mercury has decided that the DFI oil offers better protection.

My thoughts are that nothing was changed inside my motor last month, and the Premium Plus is still the same oil, so if it was the best from 2006 until last month, it's still good enough.