I run M1 TDT 5W-40 in my VX110, got 38 hours in last summer, hopefully more this year. Since an oil change is slightly over 2qts, the extra couple of dollars over Yamalube isn't a breaker, plus Yamalube is nothing special, anyways.
The MR-1 engines are bulletproof, you can run just about anything in them and they keep on purring...