When you think about it, as long as the engine is getting water and oil, angle of heel should not matter. It would seem that the question on Yanmars would depend on how much oil is in the pan and where the oil
pump is located. I would think if one''s oil pressure is ok that would indicate the
pump is pumping oil and therefore not a problem. If temp readings are ok, then it would seem the engine is getting cooled - again ok.
None of my boating friends, some of whom have Yanmars, have ever indicated anything like this to me.