I recollect reading, way way back about a taxi driver who ran an aluminium bodied cab - even further way way back I would presume. Even with a fare aboard, at signs of clatter from the engine he would drop the sump - complete with its oil, unbolt the rod caps then tin snip new shells directly from the body, bolt them in, pop the sump back on and head off with passengers still aboard.
Or is that one of those apocryphatic tales that I've latched on to somewhere?