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Why does my car schedule have a time interval for spark plug replacement #5412720 04/25/20 11:04 AM
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I notice that my car manual said to replace spark plug every 60,000 miles or 60 months. Why would there be a time interval replacement schedule. Spark plugs are made of ceramic and metal. I don't see it going bad over time if you don't drive a lot of miles like tires.

Paul

Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412728 04/25/20 11:14 AM
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To keep dealership service departments in business.

Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412735 04/25/20 11:20 AM
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May I sneak a question in?

My 15 year old vehicle's plugs are original with very low miles (<50K).

Would you change them to "break the rust" or leave 'em?

Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412736 04/25/20 11:20 AM
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To cover liability just in case anything weird goes on and they sue you for it.

They assume you will have very short trip and may gunk up the plugs.

Last edited by PandaBear; 04/25/20 11:21 AM.

"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412738 04/25/20 11:21 AM
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Mileage wears out the electrodes...however...steel sparkplug shells screwed into aluminum heads will eventually corrode until they’re impossible to remove.

Ask the guys who owned 5.4 Ford Triton engines.


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Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412741 04/25/20 11:24 AM
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Depending on the vehicle and spark plug, thread corrosion can take place. I replaced a set of AC Delco Iridiums after 10 years and they were somewhat corroded. They let go with a might squeal. They had 180,000 miles on them.

Last edited by Snagglefoot; 04/25/20 11:25 AM.

If you want the job done right......do it yourself.
Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412782 04/25/20 12:05 PM
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Part of preventive maintenance, I guess. To get good gas mileage, protect the engine, and not stress the ignition system to an early failure.

My 1st Gen CRV owner's manual says to change the plugs every 24 months or 24,000 miles, whichever comes first (probably for copper plugs). The NGK platinum plugs I put in them lasted 20,000 miles (10 years).

2007 Kia Sportage manual says change iridiums every 100,000 miles. I had to change 'em at 40,000 miles (8 years).

In both cases, the spark plugs announced the need to replace when the engines ran rough.

I have yet to change my 2012 CRV's factory iridiums as they are only at 30,000 miles and running well.

Last edited by berniedd; 04/25/20 12:10 PM.
Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412787 04/25/20 12:08 PM
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Can also be that when they review various warranty settlements, customer complaints, internal engineering reviews and component manufacturing reports ( they conduct QA/QC audits too) they can discover that on average a plug lasts this long before any number of issues statistically manifest themselves and publish a recommendation just to avoid things.

Re: Why does my car schedule have a time interval for spark plug replacement [Re: Astro14] #5412833 04/25/20 01:03 PM
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Originally Posted by Astro14
Mileage wears out the electrodes...however...steel sparkplug shells screwed into aluminum heads will eventually corrode until they’re impossible to remove.

Ask the guys who owned 5.4 Ford Triton engines.



Yup. Cost me ~$1300 to get plugs replaced on my 2004 F150 after three plugs broke off.


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Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412846 04/25/20 01:18 PM
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so what can cause spark plug to failed prematurely assuming everything is working? Does short trips gunk up the plugs? What would be the sign that plugs need replacing, you start getting lower mileage and misfires?

I have difficulty believing the dealer. My Mazda dealer tried to convince me that oil change at every 3 months and at 3,000 miles is absolutely necessary because driving in Chicago area is always severe. The manual indicate severe means driving on dirt roads, towing, hot weather, and taxi type stops. None of which describe my situation.

Then again, even the manual is suspected. The Subaru said cvt fluid is for life. I plan to keep the car beyond the 100K cvt warranty period.

Paul

Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412847 04/25/20 01:18 PM
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Originally Posted by Paul_Siu
I notice that my car manual said to replace spark plug every 60,000 miles or 60 months. Why would there be a time interval replacement schedule. Spark plugs are made of ceramic and metal. I don't see it going bad over time if you don't drive a lot of miles like tires.

Paul


What is the year, make and model?

Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412872 04/25/20 01:47 PM
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Originally Posted by Paul_Siu
I notice that my car manual said to replace spark plug every 60,000 miles or 60 months. Why would there be a time interval replacement schedule. Spark plugs are made of ceramic and metal. I don't see it going bad over time if you don't drive a lot of miles like tires.

Paul


If you drive in the city in stop and go traffic, it puts less miles, but you have may have equa or more time on the plugs, thus potentially firings of the spark plugs.

Last edited by UG_Passat; 04/25/20 01:52 PM.

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Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412875 04/25/20 01:51 PM
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Originally Posted by Paul_Siu
so what can cause spark plug to failed prematurely assuming everything is working? Does short trips gunk up the plugs? What would be the sign that plugs need replacing, you start getting lower mileage and misfires?

I have difficulty believing the dealer. My Mazda dealer tried to convince me that oil change at every 3 months and at 3,000 miles is absolutely necessary because driving in Chicago area is always severe. The manual indicate severe means driving on dirt roads, towing, hot weather, and taxi type stops. None of which describe my situation.

Then again, even the manual is suspected. The Subaru said cvt fluid is for life. I plan to keep the car beyond the 100K cvt warranty period.

Paul


I don't know about Mazda but Mercedes went to a multi spark ignition system. It can basically fire the spark plugs 4-5 times per cycle instead of the one or two in a waste fire system. Supposed to be for more complete combustion and better emissions. So it's actually getting a lot more of a workout than regular plugs. And yes, they also recommend changing the plugs at 6 years or 60k and the consensus is that it's because they don't want them to rust out in there. You might also get slightly better gas mileage with new plugs.

Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412890 04/25/20 02:01 PM
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Originally Posted by Paul_Siu
so what can cause spark plug to failed prematurely assuming everything is working? Does short trips gunk up the plugs? What would be the sign that plugs need replacing, you start getting lower mileage and misfires?


Things that affect spark plugs are also quality of fuel and motor oil

Re: Why does my car schedule have a time interval for spark plug replacement [Re: Paul_Siu] #5412899 04/25/20 02:09 PM
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To me like others stated it would be so that the plugs can be removed without issues. Most engines now have aluminum heads and the spark plugs are steel threads. Dissimilar metals and corrosion can start and lock them in. The main reason when I change mine out I put a very small amount of anti-seize on the threads.


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