I expect a decent set of water pump pliers will break the top section off then you should be able to grip the actual top.
However i wouldn't try that until you've got a replacement top in hand, in the meantime if you take the oil can inside to warm the oil thoroughly by a radiator so it flows easily, with a suitable funnel and length of thin plastic pipe you should be able to top the oil up (this is how most old school automatic transmissions are refilled at service time), albiet slowly, through the dipstick tube.
Please tell us you've got a dipstick, if not is there a suitable breather connector in the rocker cover that you could disconnect and feed the oil in there.
|