Skip the auto shop - Our mechanics make house calls

Q: Advice on changing iridium sparkplugs on a 9-year-old truck

asked by on

Is sparkplug life span measured in time only or by mileage? My truck is nine years old but has only 80,000 miles on spark iridium plug. Is there a good reason to change them up before GM's 100,000 suggested interval?

A: It's more mileage. You have to understa...

It's more mileage. You have to understand that you have iridium plugs. Iridium is a rare metal and the reason to use iridium is because it breaks down less over time inside your engine, instead of driving and having sparks explode. It's bad enough that the spark is exploding with hundreds of thousands of volts that can eat some of the metal but of course there's gasoline burning and a little oil gets inside and burns. You really have to have something that's strong. The iridium is very, very strong.

I have had GM trucks, and I've had a customer with 200,000 miles on it and the spark plugs were still good (the original iridium plugs). So, I wouldn't change them now if I were you. If you are not burning any oil or anything, it should be perfectly fine. When it's time to replace your spark plugs, you can enlist the help a certified mechanic, such as one from YourMechanic to perform this service for you promptly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Spark plug boot

Hey there. Your engine is only a 4 cylinder and a loss of one of the cylinders in the engine will mean that it will not stay running very well. You can find the complete coil pretty cheap online. If...

Q: Car running very rough

A rough idle can be caused by many things. Injector problems, worn ignition components like spark plugs and wires, or vacuum leaks are all examples of things that can cause symptoms similar to what you are describing. Products like Seafoam...

Q: Car jerking upon acceleration, sluggish engine

You will need to have the ignition and fuel systems checked. The fuel pump and filter should be checked for correct pressure and flow due to clogged filter or pump pressure. The ignition should be checked to see if the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...