if poured paraffin oil does not help.... just put engine apart to see how bad is damege..... after that you will not what to do.
mybie just bore block and change the pistons ..... and change all bearings, seals, clutch, chain, oil pump..... check the head (valve guides, valve seats), check the gearbox (synchros and all tolerace, diff pin,....) and your engine will be ready for next 200.000km!!!