I just took my old car (2004 Toyota Wish - 1.8 litre petrol engine, 185000km) to a mechanic for a basic service and warrant of fitness. The vehicle passed the warrant, but I was advised "spark plugs starting to blow through". (This is stated on the invoice description as well)
I googled the term and was surprised to come up with no results. Does anyone know what, if anything this term means? If so, would simply replacing the spark plugs fix the problem, or is it potentially more expensive then that?