How often should you change spark plugs? It’s one of the most common questions drivers have, and for good reason. Spark plugs play a critical role in your vehicle’s performance, fuel efficiency, and reliability. Ignoring them for too long can lead to rough starts, poor gas mileage, and even costly engine damage.

Why Spark Plugs Matter More Than You Think

Spark plugs are small, but they do a big job. They ignite the air and fuel mixture inside your engine, which is what gets your car moving. When they’re working properly, your engine runs smoothly and efficiently. When they’re worn out, everything starts to feel off.

You might notice:

• Slower acceleration
• Engine misfires
• Rough idling
• Decreased fuel economy

Worn spark plugs can reduce fuel efficiency by as much as 30 percent. That’s money literally burning away every time you drive.

Recommended Spark Plug Replacement Intervals

• Copper spark plugs: Every 20,000 to 30,000 miles
• Platinum spark plugs: Every 60,000 to 100,000 miles
• Iridium spark plugs: Up to 100,000 miles or more

If you’re still asking yourself, “How often should you change spark plugs?”, your owner’s manual is always the best place to start. Manufacturers give specific recommendations based on your engine design.

Signs It’s Time for New Spark Plugs

Mileage isn’t the only factor. Your car will usually give you clues when something isn’t right.

Watch for these warning signs:

• Engine hesitation when you accelerate
• Unusual vibrations or shaking
• A check engine light that won’t go away

If you notice any of these, it’s a good idea to have your vehicle inspected sooner rather than later. Waiting too long can lead to bigger issues, like damage to your ignition coils or catalytic converter.

What Happens If You Wait Too Long

Putting off spark plug replacement might not seem like a big deal at first, but it can snowball quickly.

Old spark plugs can cause incomplete combustion, which leads to:

• Increased emissions
• Carbon buildup in your engine
• Reduced engine lifespan

Professional vs DIY Replacement

Some drivers like to replace spark plugs themselves, and in certain vehicles, it’s fairly straightforward. But in many modern cars, spark plugs are harder to access and require specialized tools.

If you’re not fully confident in tackling the job yourself, it’s best to trust a professional. At Brooks Auto Doctor, technicians can evaluate your vehicle and driving habits to ensure the right maintenance is performed and handle the job efficiently.<

The Bottom Line

So, how often should you change spark plugs? For most drivers, somewhere between 30,000 and 100,000 miles is a safe range, depending on your vehicle and plug type. But don’t just rely on mileage alone. Pay attention to how your car feels and runs.

Staying ahead of this simple maintenance task can save you money, improve performance, and keep your vehicle dependable for years to come. And if you’re ever unsure, having a trusted local shop take a look can give you peace of mind and keep your car running like it should.

Routine maintenance often goes beyond spark plugs, and Brooks Auto Doctor offers a full range of auto repair services to help keep your vehicle running smoothly.