a standard spark plug should last 10-20K KM...those better/performance type should last 30-50KM....
Spark plug is wear and tear part...
Also life span of spark plug depend on your engine condition...if your engine makan engine oil / wrong tuning then your spark plug will wear out faster.
To all Altezza members...one of our members have suggested that we arrange a car care clinic ( hehehe now have clinic for our car also..:regular_smile: ) by Meguiars where they will basically teach us on how to take...