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Changing spark plugs based on age and not mileage #5265010 11/12/19 12:44 PM
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Hootbro Offline OP
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Picked up a cream puff 2013 Volkswagen Jetta with 23K miles on it that literally was a "Little Old Lady from Pasadena" type owned vehicle. Garage kept and dealer provable oil changes every 5K miles maintenance.

As I do with all new to me used vehicle, I go through maintenance schedule and work on changing out any items that can not have been proven already addressed.

Per the maintenance table, spark plugs are a every 40K miles interval but has a side note of "Every 6 years regardless of mileage: Replace spark plugs". Mileage wise, I am have another 17K miles to go. Age wise, I am pushing 7 years on the vehicle. I have never heard of changing spark plugs due to age. What are the risks of just blowing off the age requirement and running them out to the normal 40K miles before changing them?


2020 Jeep Gladiator Rubicon 3.6L (Dealer Bulk 0W-20)
2017 Jeep Renegade Latitude 2.4L (Idemitsu 0W-20)
2013 Volkswagen Jetta 2.5L (Dealer Bulk 5W-40)

Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265013 11/12/19 12:49 PM
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dbias Offline
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Having owned several VAG products I've always changed at 40k religiously. I've never had any go even close to age but I wouldn't think it would be a big deal as long as they haven't been hurt due to short tripping.
I'd concentrate on other issues first like brake fluid which is a time sensitive issue.


2011 VW JETTA Castrol Edge 0W-40
2012 FORD TRANSIT CONNECT Castrol Edge 5W-30
2016 HONDA CIVIC COUPE Casrol Edge 5w-30
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Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265021 11/12/19 12:53 PM
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BMWTurboDzl Offline
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Perhaps VAG wants to lessen the chance of having problems pulling an aged plug?


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265054 11/12/19 01:22 PM
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I change mine at 5 year mark as well as when I first buy one. On Caravan it only had 3k but build date is 12/17 so I didn't do it this time. It's called preventive maintenance.


Tiger862
2018 Grand Caravan
Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265059 11/12/19 01:24 PM
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atikovi Offline
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Originally Posted by Hootbro
Mileage wise, I am have another 17K miles to go.


If I was keeping the car I'd just keep them but remove, clean and dab anti-seize on the threads. If flipping it, replace them to give it a fresh start.

Re: Changing spark plugs based on age and not mileage [Re: BMWTurboDzl] #5265078 11/12/19 01:37 PM
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Delta Offline
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Originally Posted by BMWTurboDzl
Perhaps VAG wants to lessen the chance of having problems pulling an aged plug?


Kinda what I was thinking. The ones I did on the SLK were the original 16 year old plugs and they were in there real, real good. Glad there was only 4 because it was a nerve racking adventure I don't want to go through again...


'17 VW GTI 2.0T - 6MT - 18K - Edge 0w40
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Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265146 11/12/19 02:52 PM
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Snagglefoot Offline
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Originally Posted by Hootbro


Per the maintenance table, spark plugs are a every 40K miles interval but has a side note of "Every 6 years regardless of mileage: Replace spark plugs". Mileage wise, I am have another 17K miles to go. Age wise, I am pushing 7 years on the vehicle. I have never heard of changing spark plugs due to age. What are the risks of just blowing off the age requirement and running them out to the normal 40K miles before changing them?



I would go with the 6 years. You don’t have much to gain by pushing it.
smile


If you want the job done right......do it yourself.
Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265212 11/12/19 04:09 PM
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LotI Offline
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What are the chances a steel plug will stick in a aluminum head after 6 years?

What is the cost of replacing the cylinder head?...vs the cost of 4 plugs?

Answer those questions and I believe you will answer yourself.


03 Honda Interceptor
11 Kawasaki KLR 650
12 Ford E450 Cutaway
19 Buick Regal TourX http://www.fuelly.com/car/buick/regal_tourx/2019/loti/943992
Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265244 11/12/19 04:35 PM
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krismoriah72 Offline
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I would inspect the airbox for nests.. I picked up a 6 year old vehicle with 40K on it this year and it had a sizable nest in the airbox.

I also pulled the cabin air filter and it was pretty nasty (i dont like breathing other peoples stuff).

I pulled 2 plugs and both looked almost new..so not gonna look again for awhile.

From the story i was told mine was also owned by an older retired lady... so with that being said i know they love the brake pedal... my brakes were pretty far gone.

So mine got air filter/cabin filter/brake pads/trans fluid, a dose of Redline Si-1 with top tier gas and an italian tuneup..

Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265291 11/12/19 05:15 PM
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Hootbro Offline OP
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The cabin, air and oil filter with oil change were fresh within the last couple of weeks when I bought it. Already changed the OEM battery just because due to age but it still was in good shape.

I am probably just going to add the plugs to other things I plan to change out like the tires, brake fluid, coolant and fuel filter due to just being aged. Just my first time finding a time interval for spark plugs and thought it was a little weird.

Last edited by Hootbro; 11/12/19 05:17 PM.

2020 Jeep Gladiator Rubicon 3.6L (Dealer Bulk 0W-20)
2017 Jeep Renegade Latitude 2.4L (Idemitsu 0W-20)
2013 Volkswagen Jetta 2.5L (Dealer Bulk 5W-40)

Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265311 11/12/19 05:37 PM
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atikovi Offline
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Don't think the fuel filter is replaceable on any gas car made in the last 10 years. Transmission fluid change should be on the list but coolant should be good for 10 years.

Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265315 11/12/19 05:41 PM
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Leo99 Offline
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Based on the song lyrics, I'd change the plugs sooner than later.

And everybody's saying that there's nobody meaner than
The Little Old Lady From Pasadena.
She drives real fast and she drives real hard,
She's the terror of Colorado Boulevard.


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles (RIP)
2004 Corolla 125,000 miles
2004 Rav4 392,000 miles
2015 Camry 90,000 miles
Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265670 11/13/19 02:21 AM
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berniedd Offline
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1998 Honda developed misfires and I had to change the NGK platinum spark plugs at 10 years (20,000 miles only)! I guess the 6-year recommendation is valid.

Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265817 11/13/19 09:07 AM
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Astro14 Offline
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Electrodes wear (a tiny, tiny bit) with each firing, so you have a mileage recommendation/limit on plugs that correlates to number of firing events.

But steel threads in aluminum become difficult to remove based on heat cycles and age.

I would at least remove and examine them. I’m sure the electrodes look good.

If it were me, having gone through the trouble of removing them, new ones would go back in.

Last edited by Astro14; 11/13/19 09:07 AM.

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Re: Changing spark plugs based on age and not mileage [Re: Hootbro] #5265838 11/13/19 09:37 AM
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borgward Offline
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Any recommendation on removing them from an aluminum head after 6 years?

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