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18 AMG GTC and 22 F150 Limited. Past owner 16 Maybach, 17 Brabus Smartcar, 06 Ford E150, and 22 G70
Spark Plug Change
Hi all. I was performing the 50,000 mile maintenance on the 2016 Maybach with the v12 engine. I have Mercedes WIS maintenance procedures. One of the things it calls for is spark plug change at 50,000 miles. I took out one of the plugs and it looked almost new with no deformation or erosion on the terminals. I made the decision to defer maintenance till a later date. Just sharing my observations and decision.
Hi all. I was performing the 50,000 mile maintenance on the 2016 Maybach with the v12 engine. I have Mercedes WIS maintenance procedures. One of the things it calls for is spark plug change at 50,000 miles. I took out one of the plugs and it looked almost new with no deformation or erosion on the terminals. I made the decision to defer maintenance till a later date. Just sharing my observations and decision.
Not surprising. I wouldn't change them until at least 125,000 miles. Enjoy your ride.
Yea was thinking the same thing. I guess i find it weird that Mercedes wants them changed at 50,000.
I would check a few more..... It does not hurt to check at least half.... Look at all would be best, and at the same time, you have loosened any corrosion, 150k removal may not be so easy.
I think they moved to that interval on every engine just to have a standard. The newer v12 cars with the conventional coil packs should have far less spark plug issues than the older cars.
I’m at 50k on my 2018 S450. Went to change plugs but couldn’t locate them. Done plenty before including c class. Anyone have advice who has changed them? Or a video?
Maintaining the performance of the ignition system is important for timing, fuel economy, and emissions. A properly operating ignition system also prevents those random Check Engine lights when a single cylinder suddenly experiences a weak spark or no spark. The spark plug is located in the violent combustion chamber where it endures extreme heat cycles. As such, the plugs are the items in the ignition system most likely to fail first. So changing them at the recommended interval prevents unexpected downtime due to repairs plus it maintains optimal fuel economy.
Once or twice when I was younger, I was that guy who was broken down on the side of the road due to a basic maintenance issue that I let go too long. So now I tend to stay on top or ahead of these things. With my 2016 W222, I was doing a normal oil and air filter change around 46K miles, so I decided to change the spark plugs, ignition wires, and coils as well since I was so close to 50K miles. The plugs, wires, and coils all looked fine, but changing them also gave me peace of mind. I would much rather service the ignition system on my own timetable as opposed to being forced to do so as the result of a Check Engine light.
Same deal with my Lexus LS460. Plugs to be changed at 60K. I changed mine at 70K and they looked close to new. Only catch with Lexus is that if you don't changed at recommended miles, the emissions (convertor) warranty is null and void.
2016 S550 sport, 2018 GLC300, M3, Zo7, 2021 Sierra Denali
Originally Posted by SilverArrow44
Maintaining the performance of the ignition system is important for timing, fuel economy, and emissions. A properly operating ignition system also prevents those random Check Engine lights when a single cylinder suddenly experiences a weak spark or no spark. The spark plug is located in the violent combustion chamber where it endures extreme heat cycles. As such, the plugs are the items in the ignition system most likely to fail first. So changing them at the recommended interval prevents unexpected downtime due to repairs plus it maintains optimal fuel economy.
Once or twice when I was younger, I was that guy who was broken down on the side of the road due to a basic maintenance issue that I let go too long. So now I tend to stay on top or ahead of these things. With my 2016 W222, I was doing a normal oil and air filter change around 46K miles, so I decided to change the spark plugs, ignition wires, and coils as well since I was so close to 50K miles. The plugs, wires, and coils all looked fine, but changing them also gave me peace of mind. I would much rather service the ignition system on my own timetable as opposed to being forced to do so as the result of a Check Engine light.
What wires??? Is it not Coil and boot to spark plug??
I feel pretty stupid. I think the spark plugs are under the air filter housing and hoses but I can’t figure out how to remove these. Can’t find screws holding them in place. anyone who has done this pls share how you got to the plugs. Thx.
2016 S550 sport, 2018 GLC300, M3, Zo7, 2021 Sierra Denali
See the coils on the valve covers? remove coils and boots, and spark plugs are in the hole. Blow out hole with compressed air and clean with paper towl before you remove so nothing goes in the hole. Look on Youtube and hopefully there is a video for you. Usually a little trick to each model like a special clip or plug so you dont break it. Otherwise its usually straight forward, but I have not done My current S yet.
Thanks everyone for posting videos etc. my engine doesn’t look like any of the videos or pdfs. Mine is the S450. Anyone have access to Mercedes software that has the instructions for my car, I’d appreciate the instructions.
Finally figured out how to change the plugs in my S450. Used this video and uploaded some tips that I learnt. https://m.youtube.com/watch?v=tr809WBGb88. The S450 engine appears to be like the E400.
Detach air flow pipes at the marked spots. Unscrew the screws on the air filter housing both sides. Pull the two tops off and lay them in the center with the cables attached - easier than trying to detach the cable. There is one additional bolt on each side where the plastic attaches to the aluminum air inlets to the engine. Yank the plastic up and off and you’ll see the engine underneath. Undo the 2 bolts but don’t disconnect the cable as it’s a pain. When you pull the boot off the plug just set it aside gently. I blocked the engine air inlet with a rag so nothing falls into it. Use a pick to pull the boot off the plug otherwise you may break the boot. The pick fits in the hook shown. When reinstalling push down on the hook. Here’s the boot lying there whilst I change the plugs.
Put dielectric grease inside the boot before pushing it onto the plug. Use a lot. This all took me about 2 hours as I was extra careful not to be too rough.
Last edited by Merserybenze; Jan 17, 2022 at 04:08 PM.
Changing spark plugs on a V8 or V6 is MUCH easier due to access than changing spark plugs on an I-6. That is a general fact, and engine access for certain tasks on a V8 in general are easier than on a inline 6 engine. So just wait until the new Mercedes inline 6 becomes wide spread. Ugh. The price of a buttery smooth engine. I used to dread certain tasks on my BMW N55 engine.
Same deal with my Lexus LS460. Plugs to be changed at 60K. I changed mine at 70K and they looked close to new. Only catch with Lexus is that if you don't changed at recommended miles, the emissions (convertor) warranty is null and void.
It's threats of voiding the warranty for just about any illogical reason like this that makes some people lease cars every time.
It's threats of voiding the warranty for just about any illogical reason like this that makes some people lease cars every time.
Please correct me if I am wrong but even if it was a leased vehicle, if they deem the warranty is voided due to modifications made to the vehicle, are you on your own? On top of that, you need to pay out of pocket to fix the vehicle that warranty would had covered and also pay additional money to return it back to factory spec for the return of the vehicle at lease maturity, no? I don't lease so I don't know how it all works so comments are welcome.
I just picked up a set of (8) Bosch Spark Plugs for $34 dollars on Ebay - Im at 53,XXX miles but at that price and although I am positive the plugs currently installed are perfectly intact I figure at the price I paid preventive maintenance
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