Anyone got any suggestions on how to remove a seized dipstick? It hasn't broken inside so still have the handle but it won't budge, I've just got back from a long drive to get some heat in the engine bay but that hasn't worked, I've tried putting a screw driver in the hoop but that didn't work either, I've also sprayed it with wd40 to see if that'll work but I can't get it around the actual bit I need to