Why would he have an oil problem if his coolant light was flashing at him? There is an oil can in the central instrument panel that may illuminate if you have an oil pressure problem, ie you have a blockage or your oil pump is fuc*ed. Additionally there is supposedly an amber illumination that comes on when oil level is low but i have yet too see that illuminate. Even at times when i have been really low on oil, ie not even registering on the hatched markings of dipstick. If red comes on, you more than likely have a serious pressure problem, and usually by this time you have starved your bearings of oil and blown your engine. When the oil light illuminates, its engine off straight away, otherwise bye bye pistons and rods etc. Im intrigued to know more about this oil level sensor in the sump. Where does it link upto, i.e what extra gauge do you monitor it from?