[Yes, fly it -- but with an eye out for landing areas in case of engine out. AT 1800 hours since major overhaul -- seems to me it's time for a major overaul.
It is always a good idea to keep an eye out of an emergency landing spot.
Remember that the TBO is the RECOMMENDATION of the folks that sell the parts for the overhaul. I have run several engines beyond TBO. If the starts well, compression is good, the leak-down is reasonable and the engine isn’t making metal then why overhaul it?
