Spark plug replacement?
MBWorld Fanatic!
Joined: May 2005
Posts: 1,276
Likes: 259
1991 964 Turbo, 2002 Black E55, 2002 Black E55 " The Beast"- 2014 E63s
Spark plugs either go by the mileage or the years which ever comes first. Also make sure to use the Genuine Mercedes plugs and not OEM or OE and torque them to specs.
Thread Starter
Junior Member
Joined: Oct 2014
Posts: 50
Likes: 1
From: Near Worcester MA
2016 E63 AMG S, 2018 C300 cabrio
Replacement from the dealer is kinda pricey and I am completely ignorant when it comes to car maintenance.
I don't drive the car very much.
Super Member
Joined: Mar 2005
Posts: 653
Likes: 46
From: Twin Cities
Too many to list
The maintenance manual assumes you drive 10k miles/year so it says to change spark plugs at year 6 or 60K miles. So you still got 1 more year left but then you only got 28K and barely drive it, I'd say save your money for something else. Spark plugs don't just go foul from sitting around.
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Senior Member
Joined: Oct 2018
Posts: 498
Likes: 416
From: NYC
AMG
I would get them changed with OEM parts, but maybe at respected local Mercedes specialist shop outside of the dealer if they are charging high prices. As mentioned, plugs do require change from age aswell due to multiple reasons, one of the main being, potentially older plugs seizing and unable to be removed.
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MBWorld Fanatic!
Joined: May 2010
Posts: 1,227
Likes: 185
From: Chicago
E63 SL55 996TT C5Z06
your mileage is quite low, so if you car isnt tuned and you arent having any misfire issues, you probably could hold off on changing the plugs for a couple more years. Would only suggest replacing coil packs if you have misfire issues, but you dont appear to have any problems with misfires it sounds like.
if you do take your car to an independent shop to install new plugs BE SURE they understand how to index the new plugs properly!!!! if they go with MB OEM plugs they should index properly if they are installed and torqued to the correct spec. but if they use a different plug then you to ensure the ground strap properly lines up with the injector (SEE THIS: https://mbworld.org/forums/w212-amg/...ark-plugs.html)
if you do take your car to an independent shop to install new plugs BE SURE they understand how to index the new plugs properly!!!! if they go with MB OEM plugs they should index properly if they are installed and torqued to the correct spec. but if they use a different plug then you to ensure the ground strap properly lines up with the injector (SEE THIS: https://mbworld.org/forums/w212-amg/...ark-plugs.html)
MBWorld Fanatic!
Joined: Sep 2009
Posts: 2,824
Likes: 400
From: Houston, TX
2014 E63 AMGs, 2015 F-150 Lariat, 2010 Porsche C4S
your mileage is quite low, so if you car isnt tuned and you arent having any misfire issues, you probably could hold off on changing the plugs for a couple more years. Would only suggest replacing coil packs if you have misfire issues, but you dont appear to have any problems with misfires it sounds like.
if you do take your car to an independent shop to install new plugs BE SURE they understand how to index the new plugs properly!!!! if they go with MB OEM plugs they should index properly if they are installed and torqued to the correct spec. but if they use a different plug then you to ensure the ground strap properly lines up with the injector (SEE THIS: https://mbworld.org/forums/w212-amg/...ark-plugs.html)
if you do take your car to an independent shop to install new plugs BE SURE they understand how to index the new plugs properly!!!! if they go with MB OEM plugs they should index properly if they are installed and torqued to the correct spec. but if they use a different plug then you to ensure the ground strap properly lines up with the injector (SEE THIS: https://mbworld.org/forums/w212-amg/...ark-plugs.html)
Thanks!
Super Member
Joined: Oct 2020
Posts: 662
Likes: 279
From: ILLINOIS
2014 E63S
I really over thought this process. I played it safe and torqued everything to spec and made a mark on my spark plug socket and entension bar to where the open part of the plug was facing so everything went on properly when torqued to spec
