Cheap Amazon Chinese diesel 168F teardown, reassemble and put to work.

I disassembled a Chinese diesel single cylinder i think its 2.2 kw or almost 3hp. i thought it was a 6 hp. the add was kind of weird. I took the engine apart found metal contaminants in oil from factory. Cleaned all the parts pulled the piston found scoring on the skirt and cylinder walls (not awful but bad for brand new) I decided they were caused buy the bad oil in the crankcase from factory running checks. I assume the oil is reused after each engine and not filtered at all down the assembly line. most bolts were found to be tightened properly except the muffler. put the engine back together and installed it on a grain auger i was using to feed my seed cleaner slowly. So far i have ran it for 40 hours and no issues. it does vibrate and have different harmonics than the gas and will chuck belts if at the wrong rpm but rev it up slightly and it smooths out. i ran 8.5 hours on 3L so i figured 150 hours and the fuel itself will pay for itself. i have not loaded this engine down hardly at all and am curious t