I have already done two General overhauls, All the Gaskets plus seals, piston rings etc have all been changed. On the 2nd overhaul, the connecting rod bearings were damaged so we had to rebore the crankshaft and use 0.25mm bearings instead. Main bearings were changed as well. Our R31's odometer comes in miles so it has already travelled 238,332miles which is equivalent to 383,558km.