my car is a 54 plate Ford fiesta bottom of the range, I was driving the other day and my engine management light came on, I pulled over and first thing I did was check my oil, it was pretty much empty bar a little drop at the bottom of the dipstick, I topped it up to just above min, now the engine light is still on, I'm a bit confused is it because the oil isn't topped up fully or because that morning I had been doing stuff under the bonnet cleaning as such and spraying wd40 if I sprayed a lot on the engine, could that be the cause? I need some help I'm ripping my hair out in worry but also the financial side too!!! please help