Re: How to know when broken in? Fuel ratios?
No. What I was trying to get across to everyone, is that pretty much any type of oil will work.
These are not hi tech, precision machines, meticulously pieced together by italian engineers in a spotless facility.
They're out dated relics, handed down from the russians and bastardized by the chinese. Yet somehow, most of them work.
The longest lasting engines I've had, and still have, are filled with whatever i have laying around and they keep going.
My above post may sound like a joke, but it's all true.
And you already answered your question. If you broke it in with synthetics and it's still running, then obviously, you can.