Sorry for the minor league rant ... in similar circumstances I've just had _exactly_ the same argument with my boss, though she's in a merc car.
She's driven off with the oil light, engine warning light, in fact a feckin' christmas tree of lights on, a LOUD rattling noise and billowing smoke out the exhaust, with a wave "It'll probably be OK till I get home" ... about 18 miles away!!!!
I did ask if she had AA/RAC, she didn't believe me, merc's don't break down!!
I fully expect a call to tow her home within the hour, for which I am now unavoidably detained.