2011 RAM 1500 5.7 Hemi spark plugs: Iridiums are a bad bet?

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KMcD

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Brampton, Ontario
Ram Year
2011
Engine
Hemi 5.7
I've recently inherited my late father's 2011 Dodge RAM 1500 5.7 Hemi Laramie Longhorn. It's time to get the nickel plated copper core recommended MOPAR plugs swapped out at 210K.

The owner's manual says squat on what plugs can be used. The dealership only offers the nickel plated copper core recommended MOPAR plugs. I'd hoped to use iridium plugs for their longevity.

I've been reading in many different RAM 1500 forums, where members are responding to posts saying stick to the MOPAR nickel coated copper core recommended plugs instead of iridium plugs in a 2011. My interest in the iridium plugs is that they will have a longer life (100K km? 100K miles? not sure); I'm looking to convenience rather than cost, as I'll be living in a remote area of Ontario and will put many miles on the vehicle between towns and want a long life plug.

I'm reading too that members in different RAM forums are saying there is some problem with the coils when using iridium plugs, resulting in engine misfires in 5.7 hemi engines prior to the 2014 introduction of factory installed coils that came with iridium plugs.

So, some posts say that it's not a problem for a 2011 to have the OEM MOPAR nickel plated plugs from the dealership swapped out for iridiums. Others are saying that it's unwise to use anything that's not the MOPAR recommended plugs that need to be swapped out every 30K kilometres and that they've seen problems doing so. It's confusing to say the least.

I hope to keep this truck running for many years as a memory of my father. Insight into what I should use regarding iridium plugs or not with the original coils in place would be appreciated.
 

jws123

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I have only had luck using the OEM NGK plugs in hemis whatever it came with factory use that also you dont need to swap them every 30k i had 100k on mine when i had my 2011 lol.

others will chime in.
 

Wild one

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I've recently inherited my late father's 2011 Dodge RAM 1500 5.7 Hemi Laramie Longhorn. It's time to get the nickel plated copper core recommended MOPAR plugs swapped out at 210K.

The owner's manual says squat on what plugs can be used. The dealership only offers the nickel plated copper core recommended MOPAR plugs. I'd hoped to use iridium plugs for their longevity.

I've been reading in many different RAM 1500 forums, where members are responding to posts saying stick to the MOPAR nickel coated copper core recommended plugs instead of iridium plugs in a 2011. My interest in the iridium plugs is that they will have a longer life (100K km? 100K miles? not sure); I'm looking to convenience rather than cost, as I'll be living in a remote area of Ontario and will put many miles on the vehicle between towns and want a long life plug.

I'm reading too that members in different RAM forums are saying there is some problem with the coils when using iridium plugs, resulting in engine misfires in 5.7 hemi engines prior to the 2014 introduction of factory installed coils that came with iridium plugs.

So, some posts say that it's not a problem for a 2011 to have the OEM MOPAR nickel plated plugs from the dealership swapped out for iridiums. Others are saying that it's unwise to use anything that's not the MOPAR recommended plugs that need to be swapped out every 30K kilometres and that they've seen problems doing so. It's confusing to say the least.

I hope to keep this truck running for many years as a memory of my father. Insight into what I should use regarding iridium plugs or not with the original coils in place would be appreciated.
Swap to new OEM coils,as all the new coils are the upgraded coils for Irridium plugs. It's not 30,000 kms ,it's 30,000 miles,but you're usually good for at least 50,000 miles / 80,000 kms with the copper plugs, some guys run them alot longer then that,as evidenced by JWS's post above. Don't get sucked into an after market coil if you decide to swap coils,the OEM coils are still the best. Satera tuning has a video up showing the differance between the stock coils and one of the top after market coils,and it's not good , the aftermarket coils left a bit to be desired on the dyno.
Your stock coils will fire irridium plugs,just not a good as the newer upgraded coils with more windings will.
When you have the coils off,pull the rubber boots off,and pull the springs out of them and check them and the screw head contact in the coil tower over for corrosion,as they're famous for corroding.Rock Auto sells new rubber boots with new springs,and a few minutes spent with a dremel and a carbon steel 1/8" brush will usually clean up the screw head post under the springs.Giving you some more miles out of your stock coils.

 
Last edited:

Bigskyroadglide

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@Wild one is 100% correct. I swapped my copper plugs for iridium plugs in my 11 at 120k miles. I also swapped my coils to new stock coils from the 2015 model year. All purchased from RockAuto. The coils had the same part number and I received many comments that I was wasting $$.

NGK plugs and Mopar branded coils, that came with new rubber boots.

Once installed, no lights on the dash, no issues, truck ran great and performed as designed. Fuel economy on my 90 mile 1 way drive to work was consistently 18 to 19 MPG with the RFE and 3.55s.

Truck ran great till sold at 150K and the guy that owns it now still runs it daily and it has over 190k. To my knowledge he has not changed plugs.

My input from personal experience.
 

DAK2

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NGK 92145, LZFR5CI-11. Listed on NGK as direct replace for OEM copper nickel, does not need coil replaced.
 

truck2569

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Ram Year
2013
Engine
6.7
I've recently inherited my late father's 2011 Dodge RAM 1500 5.7 Hemi Laramie Longhorn. It's time to get the nickel plated copper core recommended MOPAR plugs swapped out at 210K.

The owner's manual says squat on what plugs can be used. The dealership only offers the nickel plated copper core recommended MOPAR plugs. I'd hoped to use iridium plugs for their longevity.

I've been reading in many different RAM 1500 forums, where members are responding to posts saying stick to the MOPAR nickel coated copper core recommended plugs instead of iridium plugs in a 2011. My interest in the iridium plugs is that they will have a longer life (100K km? 100K miles? not sure); I'm looking to convenience rather than cost, as I'll be living in a remote area of Ontario and will put many miles on the vehicle between towns and want a long life plug.

I'm reading too that members in different RAM forums are saying there is some problem with the coils when using iridium plugs, resulting in engine misfires in 5.7 hemi engines prior to the 2014 introduction of factory installed coils that came with iridium plugs.

So, some posts say that it's not a problem for a 2011 to have the OEM MOPAR nickel plated plugs from the dealership swapped out for iridiums. Others are saying that it's unwise to use anything that's not the MOPAR recommended plugs that need to be swapped out every 30K kilometres and that they've seen problems doing so. It's confusing to say the least.

I hope to keep this truck running for many years as a memory of my father. Insight into what I should use regarding iridium plugs or not with the original coils in place would be appreciated.
People tell me the same thing all the time but I buy aftermarket products for my truck all the time and it runs just fine. If Ram didn't mark up there products so much that would be different. Just saying. Buy iridium but keep a new set of nickel coated in case you have problems.
 

Wild one

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I've recently inherited my late father's 2011 Dodge RAM 1500 5.7 Hemi Laramie Longhorn. It's time to get the nickel plated copper core recommended MOPAR plugs swapped out at 210K.

The owner's manual says squat on what plugs can be used. The dealership only offers the nickel plated copper core recommended MOPAR plugs. I'd hoped to use iridium plugs for their longevity.

I've been reading in many different RAM 1500 forums, where members are responding to posts saying stick to the MOPAR nickel coated copper core recommended plugs instead of iridium plugs in a 2011. My interest in the iridium plugs is that they will have a longer life (100K km? 100K miles? not sure); I'm looking to convenience rather than cost, as I'll be living in a remote area of Ontario and will put many miles on the vehicle between towns and want a long life plug.

I'm reading too that members in different RAM forums are saying there is some problem with the coils when using iridium plugs, resulting in engine misfires in 5.7 hemi engines prior to the 2014 introduction of factory installed coils that came with iridium plugs.

So, some posts say that it's not a problem for a 2011 to have the OEM MOPAR nickel plated plugs from the dealership swapped out for iridiums. Others are saying that it's unwise to use anything that's not the MOPAR recommended plugs that need to be swapped out every 30K kilometres and that they've seen problems doing so. It's confusing to say the least.

I hope to keep this truck running for many years as a memory of my father. Insight into what I should use regarding iridium plugs or not with the original coils in place would be appreciated.
OP whatever you do, "Do Not " buy plugs off Amazon or Ebay. Odds are you'll end up with fake / knock-off plugs,that can cause some serious issues. Stick with buying them from Rock Auto / your local brick and mortar parts store like Napa / Bumper to Bumper etc,or your local dealer
 
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KMcD

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OP whatever you do, "Do Not " buy plugs off Amazon or Ebay. Odds are you'll end up with fake / knock-off plugs,that can cause some serious issues. Stick with buying them from Rock Auto / your local brick and mortar parts store like Napa / Bumper to Bumper etc,or your local dealer
I appreciate that insight. Will steer clear of online options, and go with Napa.
 

EdGs

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I appreciate that insight. Will steer clear of online options, and go with Napa.
Don't know if this is true or not, but have heard that Advance or Autozone will pricematch, so show them the price on RockAuto for the 92145's if they are too high.

Worth a shot, anyway. I know the plugs run $6 - $7 on RockAuto, but it's been a while since I looked. Prices have gone stupid over the last couple years.
 

truck2569

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I appreciate that insight. Will steer clear of online options, and go with Napa.
Rock auto sells a lot of the same products as NAPA does just cheaper. But you might have to wait a couple days for them. I bought a window mechanism from rock auto came in a ram box the same part from napa cost almost double what I paid through rock auto. difference is if it is a project your in the middle of and need it now is all.
 
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