changed my spark plugs today .. and good i did the ones in there were completely fooked

the first spark plug was very oily tho but the bottom flint part was dry..and the rest of the 3 plugs wer completey dry...

and now after i changed them my coolant light has come on??
checked the coolant bottle and it is circulating coolant fine no leaks etc etc so im

edit: also vag com'd it and no fault codes
