Re: Yanmar hard starting question
Fair enough comment - consumer protection is alive and well, in the USA at least.
But, playing devil's advocate: Suppose some-one wishing to 'feel good' put an additive in during the early life of the engine. It does not run-in the way it should - for whatever reason. The engine is serviceable, but oil consumption is excessive. The manufacturer makes no guarantees about maximum oil consumption - we have just come expect it to be almost minimal in today's engines.
I don't think anyone could be held to blame for that except the owner.