on my fiesta 2.0 si the oil light usually comes on for a second and then goes off when i turn the ignition on, but tonight it didnt do it no matter how many times i turned the igntion, i drove home really slowly (under 2miles) just to be on the safe side now what can it be? im gonna start with the obvious tomorow and change the bulb but does anybody know what it might mean, i looked in haynes and it only stated for when the bulb was on with the engine running, or am i just being paranoid? thanks