It is NOT normal TW3 stuff. Its special for direct injection.
Right. It is "special" marketing to suck more $$$ out of the buyer. We have been running direct injection since the early 2000's with the first Yamaha OX66's came out. Still run a few of the OX66's and HPDI's but have largely moved to OptiMax over the last 5 years on the 2-stoke side.
Coming from a guy with over 40 (2011-2015) OptiMax 250 HP's in service you do not need to pay $45/gal for the "recommended" oil, but of course your local Merc shop will not tell you that.