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changed the factory plugs at 58K here's the results
Most of them look fine but the plug on the far left did have a little oil and the insulator we a little darker than most. I'm not that concerned about it but I will keep an eye on it.
Most of them look fine but the plug on the far left did have a little oil and the insulator we a little darker than most. I'm not that concerned about it but I will keep an eye on it.
Your plugs dont look to bad at 58k miles. What year is your 63? I thought the stock/factory plugs were made by Bosch (not NGK) on the 2014-2016 but maybe I'm wrong
Mine is a 2011, I was going back and forth between two 2011s local to me. The one I bought had 15k less miles, new tires and newer brakes vs the other. The other car was $4500 cheaper but had the white valve covers the one I bought are the black. From what I understand that's not always a sure thing that the newer headbolts are used but it was enough for me to choose the more expensive one.
those plugs looks about the same as mine. I just got my 2014 E63 amg s plugs replaced by my local dealership too. I have to ask for it since my car only has 52,000 miles. I have a three years pre-paid service contract, so they were okay to do this service for me. They also replaced my trunk battery since it was low.
Are the plugs from FcP euro pre gapped and are just remove and replace.
if not what tool is recommended to gap prior to
install
I personally am an OEM MB brand plug guy as they work well in general.
This is not to say the two other NGK plugs available for our engines dont work well and the Bosch branded plugs don't.
I know a few friends of mine with these plugs that are working great.
Best is to talk to your tuner and see what they recommend and what gap.
Just a PSA i guess for the community or to clear up some general forum information from the past, when it comes to the OEM MB Bosch plugs and for plugs in general for the M157:
Early OEM MB Bosch plugs Z6SII3320 were used in the M157 well into 2014's model years +, These plugs had a tendency on some tuned cars to fail, esp with some miles on them, the white ceramic would separate into two and of course misfires would ensue and the plug would be basically dead. The white ceramic would just separate into two and slip down loosely onto the ground strap but cause no harm to the engine, or any pieces inside the engine, just a dead plug.
In Rare instances, the ground strap and ceramic would break apart into pieces, that would mean pieces in your engine of course and that is bad news.
This has happened on stock engines, not just tuned, but of course tuned engines accelerated this process.
Mercedes revised the plugs to Z6SII3320R, adding the R designation at the end. These are the plugs that you buy today from MB.
I have talked to the Bosch engineers, it is a revised plug with updated internal materials. I know many forum posts in the past stated this was a colder plug, but that isn't the case, they are the same in that regard.
This model # and plug is specific and only made for Mercedes from Bosch according to MB requirements.
Bosch does make their own spark plug for this engine outside of MB specifics,it is ZRSII3320; The 'R' after the 'Z' here. This isn't the same plug according to them as the OEM MB plugs, and is a different makeup but same heat range.
Moral of the story, when tuned, change your plugs and change them often
Here is an visual from an internal document from Germany my good friend has sent me:
Here is the tool I use when gapping plugs, you do not want to use the old cheap coin gapper, those can cause issues to our sensitive modern plugs. You would want this tool to do safe and precise gapping and of course using it with feeler gauges or wire gauge to make sure your gap is spot on. This gap tool can be bought from burger motorsports website.
The OEM tool from MB makes the job easy, it holds the plug like most sockets, but also has the universal joint built in and the perfect length to put a socket right on it without any other extensions or joints. It is expensive at about 70-90$
I personally am an OEM MB brand plug guy as they work well in general.
This is not to say the two other NGK plugs available for our engines dont work well and the Bosch branded plugs don't.
I know a few friends of mine with these plugs that are working great.
Best is to talk to your tuner and see what they recommend and what gap.
Just a PSA i guess for the community or to clear up some general forum information from the past, when it comes to the OEM MB Bosch plugs and for plugs in general for the M157:
Early OEM MB Bosch plugs Z6SII3320 were used in the M157 well into 2014's model years +, These plugs had a tendency on some tuned cars to fail, esp with some miles on them, the white ceramic would separate into two and of course misfires would ensue and the plug would be basically dead. The white ceramic would just separate into two and slip down loosely onto the ground strap but cause no harm to the engine, or any pieces inside the engine, just a dead plug.
In Rare instances, the ground strap and ceramic would break apart into pieces, that would mean pieces in your engine of course and that is bad news.
This has happened on stock engines, not just tuned, but of course tuned engines accelerated this process.
Mercedes revised the plugs to Z6SII3320R, adding the R designation at the end. These are the plugs that you buy today from MB.
I have talked to the Bosch engineers, it is a revised plug with updated internal materials. I know many forum posts in the past stated this was a colder plug, but that isn't the case, they are the same in that regard.
This model # and plug is specific and only made for Mercedes from Bosch according to MB requirements.
Bosch does make their own spark plug for this engine outside of MB specifics,it is ZRSII3320; The 'R' after the 'Z' here. This isn't the same plug according to them as the OEM MB plugs, and is a different makeup but same heat range.
Moral of the story, when tuned, change your plugs and change them often
Here is an visual from an internal document from Germany my good friend has sent me:
Here is the tool I use when gapping plugs, you do not want to use the old cheap coin gapper, those can cause issues to our sensitive modern plugs. You would want this tool to do safe and precise gapping and of course using it with feeler gauges or wire gauge to make sure your gap is spot on. This gap tool can be bought from burger motorsports website.
The OEM tool from MB makes the job easy, it holds the plug like most sockets, but also has the universal joint built in and the perfect length to put a socket right on it without any other extensions or joints. It is expensive at about 70-90$
do you have a part number for those tools? The spark plug socket with swivel?
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