Is it necessary to replace spark plugs on a regular basis?

I just got a Ford Focus and I'm wondering if I should replace the spark plugs regularly. Are they important for the car's performance or can I wait until I notice a difference?

Yes, replacing spark plugs on a regular basis is important for maintaining your car's performance. They help ignite the fuel in your engine and if they are worn out, it can affect your car's fuel efficiency and power.

I would recommend replacing your spark plugs every 30,000 miles or according to your car's recommended maintenance schedule. It's better to be proactive about maintenance rather than waiting until you notice a difference in performance.

Spark plugs are relatively inexpensive and easy to replace, so it's worth doing on a regular basis to keep your car running smoothly. I suggest replacing them every 2-3 years, even if you haven't reached the mileage recommendation.