I am currently breaking in a DA 50 with lawnboy at 32:1, at a slightly rich setting. The engine runs very well, shows no sign of overheating, and has plenty of power for my needs.

You will be able to tell from this question that I don't have much experience with these engines - but, what is the downside of never switching to a synthetic oil, in other words what would happen if I just ran lawnboy 32:1 indefinitely?