Jun 15, 2015, 07:58 PM
Last edit by: IB Advertising
See related guides and technical advice from our community experts:
- Mercedes Benz E Class AMG: How to Replace Spark Plugs
Step by step instructions for do-it-yourself repairs
E55 Spark Plug Questions And Answers. Experienced opinions/facts needed.
Senior Member
Joined: Oct 2011
Posts: 419
Likes: 3
From: Southern Maryland USA
06 E55 AMG, 13 C63 AMG
I found if you remove the coil pack it gives you more working room to get in there.
If the plugs resist coming out, do not force them. Work slow and spray the penetrating oil into the treads. Use a 1/4 out, 1/8 turn back in. Stop and let the threads cool. There can be a lot of friction and that builds heat and you can easily mess up the threads.
G
If the plugs resist coming out, do not force them. Work slow and spray the penetrating oil into the treads. Use a 1/4 out, 1/8 turn back in. Stop and let the threads cool. There can be a lot of friction and that builds heat and you can easily mess up the threads.
G
MBWorld Fanatic!
Joined: Aug 2010
Posts: 2,156
Likes: 7
From: Northern Va
Dirt Scooters
I found if you remove the coil pack it gives you more working room to get in there.
If the plugs resist coming out, do not force them. Work slow and spray the penetrating oil into the treads. Use a 1/4 out, 1/8 turn back in. Stop and let the threads cool. There can be a lot of friction and that builds heat and you can easily mess up the threads.
G
If the plugs resist coming out, do not force them. Work slow and spray the penetrating oil into the treads. Use a 1/4 out, 1/8 turn back in. Stop and let the threads cool. There can be a lot of friction and that builds heat and you can easily mess up the threads.
G
A little extra time and patience could save a lot of money and the hassle it would be if you messed the threads up. I've never heard of anyone messing the threads up but theres always a first.
Senior Member
Joined: Oct 2011
Posts: 419
Likes: 3
From: Southern Maryland USA
06 E55 AMG, 13 C63 AMG
I changed plugs on a 95 Maxima once and it took me 3 days to complete it. Squeek, squeek...
Those plugs tried to weld themselves to the heads. Got it done, damage free.
G
Those plugs tried to weld themselves to the heads. Got it done, damage free.
G
Newbie
Joined: Feb 2013
Posts: 5
Likes: 0
03 s55
Oh I love em ford 3vs. 3expeditions 3 top overhauls. Plugs didnt break threads just came off clean. I always put a dab of antiseize. Been helping so far. Oh and I never let the plugs stay on for more than a year. Just unscrew a couple turns then retighten.
MBWorld Fanatic!
iTrader: (1)
Joined: Jan 2012
Posts: 2,092
Likes: 29
From: Orlando
1967 Pro Touring turbo LSX Camaro
Lol even better than the 3V were the earlier 5.4 2V supercharged engines from the Lightning and Harley truck. There were like 3 threads of engagement designed into the heads. Owners and techs alike would strip the plugs installing them, and on occasion nearly strip them only later to have the plug(s) shoot out of the head like little missiles.
MBWorld Fanatic!
Joined: Aug 2010
Posts: 2,156
Likes: 7
From: Northern Va
Dirt Scooters
Lol even better than the 3V were the earlier 5.4 2V supercharged engines from the Lightning and Harley truck. There were like 3 threads of engagement designed into the heads. Owners and techs alike would strip the plugs installing them, and on occasion nearly strip them only later to have the plug(s) shoot out of the head like little missiles.
I bet i've done a good 20-25 cylinder head jobs on the ford 2v/3v engines before i got out of the business. I have a guy that works for me that stripped 3 cylinders changing plugs on his wifes expedition last night (5.4 3V) so tomorrow i'm going to heli coil them with the repair kit i've got. The E55's have almost to many threads.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: Jan 2011
Posts: 2,127
Likes: 4
From: Chicagoland
AMG
I heard about the plug change on an E55 being tricky. But with the valve covers and all the coils and etc off, I found it VERY easy to do. The only tools I used were a 3/8 ratchet, 3 inch extension, and a 5/8 plug socket. I also used an impact to torque them down. JK JK 
Newbie
Joined: Feb 2013
Posts: 5
Likes: 0
03 s55
after 2 out of town trips and around 500 miles, my Toyota plugs( yes, my plugs have a Toyota logo on em) seem to be doing nice. Nice burn, goodpower from engine and got a few more miles per gallon.
I do believe that the plugs themeselves dont have much to do with improvements but more on the fact that I just replaced plugs with 100k plus miles on. Main point of my first post was not a copper, iridium, platinum shoot out but more of a cheap plugs can be used without harm thing. 30 dollar plug change is big savings compared to 170 dollars.
I do believe that the plugs themeselves dont have much to do with improvements but more on the fact that I just replaced plugs with 100k plus miles on. Main point of my first post was not a copper, iridium, platinum shoot out but more of a cheap plugs can be used without harm thing. 30 dollar plug change is big savings compared to 170 dollars.
MBWorld Fanatic!
Joined: Jan 2011
Posts: 2,127
Likes: 4
From: Chicagoland
AMG
after 2 out of town trips and around 500 miles, my Toyota plugs( yes, my plugs have a Toyota logo on em) seem to be doing nice. Nice burn, goodpower from engine and got a few more miles per gallon.
I do believe that the plugs themeselves dont have much to do with improvements but more on the fact that I just replaced plugs with 100k plus miles on. Main point of my first post was not a copper, iridium, platinum shoot out but more of a cheap plugs can be used without harm thing. 30 dollar plug change is big savings compared to 170 dollars.
I do believe that the plugs themeselves dont have much to do with improvements but more on the fact that I just replaced plugs with 100k plus miles on. Main point of my first post was not a copper, iridium, platinum shoot out but more of a cheap plugs can be used without harm thing. 30 dollar plug change is big savings compared to 170 dollars.
Junior Member
Joined: Jan 2013
Posts: 50
Likes: 7
From: Rancho Santa Margarita, CA
2016 E63S
I remember reading a thread about this question, but I can't find it any more. I know the stock plugs are NGK ILFR6A. I see NGK also offers a plug, LFR6AIX-11, that fits. It is the same heat range as the stocker, but supposedly more high performance? NGK says it's the ultimate in design and performance. 
The LFR6AIX-11 is about $3-4 cheaper per plug. Is there any downside to this plug? I certainly don't mind spending the extra $60 if I'm getting the best plugs, but I don't mind saving the $60 if I can.
The LFR6AIX-11 is about $3-4 cheaper per plug. Is there any downside to this plug? I certainly don't mind spending the extra $60 if I'm getting the best plugs, but I don't mind saving the $60 if I can.
Super Member
Joined: Mar 2007
Posts: 946
Likes: 1
From: Bay Area
03 C32 gone, 06 CLS55, 16 Tesla X
I also have question if someone can tell the diff why these two items on eBay are so different in price other then the covers? Is one particular better then the other? Or they are all the same?
And where to get now if it's better price?
Much thank!
http://www.ebay.com/itm/NGK-Iridium-IX-Spark-Plugs-04-12-Subaru-Impreza-STI-Set-of-4-One-Step-Colder-/360563565679?pt=Motors_Car_Truck_Parts_Accessories&hash=item53f343646f&vxp=mtr
And
http://www.ebay.com/itm/LFR7AIX-2309-NGK-Iridium-IX-spark-plugs-set-of-4-/271166629702?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f22ca6746&vxp=mtr
And where to get now if it's better price?
Much thank!
http://www.ebay.com/itm/NGK-Iridium-IX-Spark-Plugs-04-12-Subaru-Impreza-STI-Set-of-4-One-Step-Colder-/360563565679?pt=Motors_Car_Truck_Parts_Accessories&hash=item53f343646f&vxp=mtr
And
http://www.ebay.com/itm/LFR7AIX-2309-NGK-Iridium-IX-spark-plugs-set-of-4-/271166629702?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f22ca6746&vxp=mtr
Junior Member
Joined: Jan 2013
Posts: 50
Likes: 7
From: Rancho Santa Margarita, CA
2016 E63S
I remember reading a thread about this question, but I can't find it any more. I know the stock plugs are NGK ILFR6A. I see NGK also offers a plug, LFR6AIX-11, that fits. It is the same heat range as the stocker, but supposedly more high performance? NGK says it's the ultimate in design and performance.
The LFR6AIX-11 is about $3-4 cheaper per plug. Is there any downside to this plug? I certainly don't mind spending the extra $60 if I'm getting the best plugs, but I don't mind saving the $60 if I can.
The LFR6AIX-11 is about $3-4 cheaper per plug. Is there any downside to this plug? I certainly don't mind spending the extra $60 if I'm getting the best plugs, but I don't mind saving the $60 if I can.
MBWorld Fanatic!
Joined: Dec 2011
Posts: 1,226
Likes: 24
Mercedes
I recently replaced all my plugs with the Bosch ones, and now my car idles a little rough. Not sure what happened, or if my car is just really picky.
Going to order replacement ILFR6A plugs and install those. Thankfully since I'm installing headers soon, replacing the plugs as well won't be much additional work.
Going to order replacement ILFR6A plugs and install those. Thankfully since I'm installing headers soon, replacing the plugs as well won't be much additional work.
