have you changed the oil since it was set up again ?

if it's been badly overfuelling for a while that could account for the fuel in the oil and could also cause premature wear in the bores due to bore wash.. basically the excess fuel removes the oil film from the bores and the rings wear faster.

if the oil is thinned out by the fuel it could be passing the rings easier..

Get a comp test done and change the oil and see what you're left with if the comp test is 'normal'..

hth