3: Changing spark plugs can save you fuel
Spark plugs with 130,000 kilometres on them are 80 per cent worn. During those last 32,000 km, you experience more misfires and incomplete combustion, wasting hundreds of dollars in fuel. Spark plugs have to be replaced anyway, so do it early and save money. The extra time you spend replacing plugs over the life of the car will still benefit you greatly. Also, don’t assume your plugs are good for 160,000 km. Spark plugs must be replaced every 50,000 kilometres or 100,000 kilometres for many four-cylinder engines.