When Do You Have To Change Your Spark Plugs On Your Car?

Not very often at all, in fact very rarely will you need to replace spark plugs yourself. In the past, spark plugs were changed generally every 30,000 miles, or when there was an issue with the car which could relate to wear on the spark plugs. This however is no longer the case; modern cars are designed to require far less maintenance especially in terms of wear and tear. It is therefore not generally necessary to change them yourself.

If, when a car is serviced, spark plugs appear to be worn they will be changed, this is likely to be frequent enough. Usually this will occur every 80,000 - 90,000 miles, although they can last even longer. Spark plugs very rarely experience any problems other than wear which is easily diagnosed and remedied. It is always worth asking your garage when they service your car just to check the general condition of your spark plugs, especially when you are reaching 80,000 miles.

If you drive an older car, they may need to be changed more often; in this case there are a number of tell tale signs which can indicate worn spark plugs, including;

- Changes in the overall performance of a car
- Increased fuel consumption
- Above normal emission figures
- Increased noise in the car

If you notice any of these problems, you could either change the spark plugs yourself or take the vehicle to your garage and ask them to check the spark plugs.

In essence, it is unlikely you will ever need to change spark plugs as they last a long time, and when they are becoming worn it can be done during the car's routine service.

Usually spark plugs in today's cars last a very long time, not like the older vehicles. This is due to the engine being more efficient and gasoline is a better grade. I usually run around 40,000 miles before changing plugs, some people go as far as 100,000 miles. The maker of you vehicle should have a reference guide in the owners manual though.

Spark plugs have gotten much better. Most auto manufacturers recommend that you change the plugs between 60,000 and 100,000 miles. It used to be around 30,000 but with the use of platinum plugs and different materials, they last much longer.

I would pull on plug and see if the electrode looks to be rounded in any way. If it is, then replace them, if it looks flat, then put it back in. If you question it, then chances are others could be slightly worse so go ahead and change them as you have nothing to loose and everything to gain including better gas milage.

I have a pathfinder its has 140715miles and havent change my spark plugs when should I do it