I assume the spark plug with the oil in the well is the one closest the oil filler cap .... that wont effect car starting anyway .....
Did you start the car .. move it a few meters and then turn it off again yesterday ?
If so you have the quirky mid 90s starting problem that effected many cars mercs included ....
Basically its flooded with petrol .... you can leave it for a bit and then try and start it .... as it seems you have tried ... ..... So can you smell petrol ?
if you can smell petrol .......
If that doesnt work sometimes you can hold accelertor pedal to floor and turn over for about 10-15 seconds and it will literally chug into life ... clearing the unburnt fuel ... DONT turn over for much longer than 20 seconds as it can stuff up the starter motor ..... and will drain the battery.
If it doesnt even try to fire .. ie just turns over with no firing sounds at all .......
Failing that it could be something failed like the coil .... but then you would need to read the flashing code from the ECU (dpending on what model you have ).... to see what its saying has failed ...
My coil failed years ago and turned over but wouldnt fire ..... read the flashing code ...said coil failure .... someone on here sent me a replacement distributor (coil built in) and fired on first turn of key ....
So if its not even trying to fire ... somethings disconnected or failed .... likely something cheap
Also when mine failed last time, someone mentioned the ignitionckey connections wiring can get loose and not make the ignition connection ... thus the car wont start ...
So let us know what year engine size and mileage it is and its easier to give some pointers....
