GLK350 Sprark Plugs - DIY
Thread Starter
MBWorld Fanatic!
Joined: Jan 2009
Posts: 2,780
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From: Northern NJ
GLK 350 / Porsche 993
GLK350 Sprark Plugs - DIY
I just rolled over 63k and realized I needed to do plugs.
I ordered 6 bosch plugs from FCP euro in CT for $49.44. Changing plugs was easier than the oil change. 2 of us did both (plugs and oil change) in a bit over an hour.
I actually called dealer after the fact to see what this would cost. Dealer wants 367 plus tax, which is an incredible rip off.
Quick steps:
- Remove the air filter cover
- Remove coilpack bolts (2 per coil pack - you need T30 torx iirc)
- Unplug coilpacks - leave them such that you can figure out the order they go back in or just do one at a time.
- Replace sprakplugs - they came out easy and they looked perfectly fine.
- Make sure not to cross thread the new plugs. I didn't use any anti-seize.
- Plug the coilpacks back in, put bolts back in, put airfilter box back.
- Have a beer you are done.
Sorry no pics, but you can google for E350 W212 DIYs.
I ordered 6 bosch plugs from FCP euro in CT for $49.44. Changing plugs was easier than the oil change. 2 of us did both (plugs and oil change) in a bit over an hour.
I actually called dealer after the fact to see what this would cost. Dealer wants 367 plus tax, which is an incredible rip off.
Quick steps:
- Remove the air filter cover
- Remove coilpack bolts (2 per coil pack - you need T30 torx iirc)
- Unplug coilpacks - leave them such that you can figure out the order they go back in or just do one at a time.
- Replace sprakplugs - they came out easy and they looked perfectly fine.
- Make sure not to cross thread the new plugs. I didn't use any anti-seize.
- Plug the coilpacks back in, put bolts back in, put airfilter box back.
- Have a beer you are done.
Sorry no pics, but you can google for E350 W212 DIYs.
Member
Joined: Dec 2012
Posts: 153
Likes: 8
2011 GLK350
Here are a few photos of what's involved. I'd say this is one of the easiest plug replacements I have done in years (40 minutes total including photos, compared to about 4 hours on my minivan where half the motor top end needs to come apart). I hardly dove into my toolbox and didn't even get my gloves dirty. Fun!
First remove the front plastic piece by pulling up:
Then disconnect the one hose in the middle and two large ducts on each side of the air box:
Undo the clip on the back of the airbox, and pull up to remove. Here you can see the attach clips on the bottom of the airbox that you need to disengage and will need to reengage:
Now you can see the two timing covers with the coil packs. Passenger side:
Driver side. If only the minivan was so accessible!
Each coil pack is held by two T30 torx screws:
Remove the screws, and pull up on the coil pack to remove. Here is what it looks like once out:
Here is the spark plug, deep in the timing cover:
Remove it with a 5/8" spark plug socket:
Here are all the coil packs removed:
Here is an old plug next to new. The old ones had more wear than I expected:
These are the plugs I used, Bosch YR7MPP33:
I used some dielectric grease on each ceramic electrode to make it easier to remove the coil packs next time:
I torqued each spark plug to 23 Nm, and each coil pack screw to 9 Nm. Pop on the airbox (make sure all corners seat properly), connect ducts/hoses/clips, and call it a day. Too early in the morning for a beer
.
First remove the front plastic piece by pulling up:
Then disconnect the one hose in the middle and two large ducts on each side of the air box:
Undo the clip on the back of the airbox, and pull up to remove. Here you can see the attach clips on the bottom of the airbox that you need to disengage and will need to reengage:
Now you can see the two timing covers with the coil packs. Passenger side:
Driver side. If only the minivan was so accessible!
Each coil pack is held by two T30 torx screws:
Remove the screws, and pull up on the coil pack to remove. Here is what it looks like once out:
Here is the spark plug, deep in the timing cover:
Remove it with a 5/8" spark plug socket:
Here are all the coil packs removed:
Here is an old plug next to new. The old ones had more wear than I expected:
These are the plugs I used, Bosch YR7MPP33:
I used some dielectric grease on each ceramic electrode to make it easier to remove the coil packs next time:
I torqued each spark plug to 23 Nm, and each coil pack screw to 9 Nm. Pop on the airbox (make sure all corners seat properly), connect ducts/hoses/clips, and call it a day. Too early in the morning for a beer
.
Last edited by lyonkster; Mar 23, 2019 at 02:31 PM.
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Junior Member
Joined: Nov 2013
Posts: 22
Likes: 2
From: Ithaca, NY
2010 C300, 2015 GLK350
Senior Member
Joined: Jul 2014
Posts: 422
Likes: 61
From: South East US.
2015 GLK350
In a word, yes. Shop around and check the dealer website for service deals/coupons. I just had the plugs done in my 2015 with the m276 engine for $580 including a loaner and car wash. I used a 10% off coupon.
Thread Starter
MBWorld Fanatic!
Joined: Jan 2009
Posts: 2,780
Likes: 115
From: Northern NJ
GLK 350 / Porsche 993
I just did plugs on 2014 E-350...definitely more PITA than M272. I think dealer quote was 600 or 800, something stupid. But I would actually rate this more difficult than brakes, because it's a maze of wires and hoses you are dealing with when taking entire intake manifold. Good time to replace the air filter if you have done it.
If you DIY, get new intake manifold gaskets, make sure all vacuum hoses are plugged back. You will also need skinny E8 (1/4 inch) and the new 12 point spark plug socket.
Google for PDF of DIY there is a good one out there with a tip on pulling coils off the plugs using a string, we arrived at the same for 2 coils on driver side where access gets dodgy due to ECU brackets and wires.
If you DIY, get new intake manifold gaskets, make sure all vacuum hoses are plugged back. You will also need skinny E8 (1/4 inch) and the new 12 point spark plug socket.
Google for PDF of DIY there is a good one out there with a tip on pulling coils off the plugs using a string, we arrived at the same for 2 coils on driver side where access gets dodgy due to ECU brackets and wires.
Newbie
Joined: May 2015
Posts: 8
Likes: 0
glx320
I just rolled over 63k and realized I needed to do plugs.
I ordered 6 bosch plugs from FCP euro in CT for $49.44. Changing plugs was easier than the oil change. 2 of us did both (plugs and oil change) in a bit over an hour.
I actually called dealer after the fact to see what this would cost. Dealer wants 367 plus tax, which is an incredible rip off.
Quick steps:
- Remove the air filter cover
- Remove coilpack bolts (2 per coil pack - you need T30 torx iirc)
- Unplug coilpacks - leave them such that you can figure out the order they go back in or just do one at a time.
- Replace sprakplugs - they came out easy and they looked perfectly fine.
- Make sure not to cross thread the new plugs. I didn't use any anti-seize.
- Plug the coilpacks back in, put bolts back in, put airfilter box back.
- Have a beer you are done.
Sorry no pics, but you can google for E350 W212 DIYs.
I ordered 6 bosch plugs from FCP euro in CT for $49.44. Changing plugs was easier than the oil change. 2 of us did both (plugs and oil change) in a bit over an hour.
I actually called dealer after the fact to see what this would cost. Dealer wants 367 plus tax, which is an incredible rip off.
Quick steps:
- Remove the air filter cover
- Remove coilpack bolts (2 per coil pack - you need T30 torx iirc)
- Unplug coilpacks - leave them such that you can figure out the order they go back in or just do one at a time.
- Replace sprakplugs - they came out easy and they looked perfectly fine.
- Make sure not to cross thread the new plugs. I didn't use any anti-seize.
- Plug the coilpacks back in, put bolts back in, put airfilter box back.
- Have a beer you are done.
Sorry no pics, but you can google for E350 W212 DIYs.
Senior Member
Joined: Jul 2014
Posts: 422
Likes: 61
From: South East US.
2015 GLK350
Out Of Control!!
Joined: Sep 2018
Posts: 14,666
Likes: 4,568
From: unbegrenzt
2017 GLE350 4MATIC
M276 spark plugs are not too bad, but it takes time. Approx 1hour for the passenger side, 2-2.5 hrs for the driver's side. The driver's side has the ECU, ECU bracket, large ECU harness, PCV/vacuum lines and the steering shaft.
Newbie
Joined: Feb 2016
Posts: 14
Likes: 3
2013 GLK350
Member
Joined: Mar 2017
Posts: 182
Likes: 45
From: Toronto, Canada
2010 GLK350 4matic
I’ve always used the recommended Bosch double platinum plugs, noticed now that Rockauto has Ruthenium for a couple bucks more per plug, it is also a popular order. Is this something to consider? Regardless, it would very likely be the last spark plug change on my high mileage M272
MBWorld God!
Joined: Dec 2019
Posts: 32,222
Likes: 6,281
I’ve always used the recommended Bosch double platinum plugs, noticed now that Rockauto has Ruthenium for a couple bucks more per plug, it is also a popular order. Is this something to consider? Regardless, it would very likely be the last spark plug change on my high mileage M272
Super Member
Joined: Feb 2023
Posts: 728
Likes: 271
2011 GLK 350 4Matic
Member
Joined: Mar 2017
Posts: 182
Likes: 45
From: Toronto, Canada
2010 GLK350 4matic
Newbie
Joined: Apr 2025
Posts: 13
Likes: 3
From: Toronto
GLK350 4Matic, 135i MSport
Recommended replacement interval according to the manufacturer? Never. I'd recommend following their advice on the subject...
https://www.youtube.com/watch?v=nBATO0FCTEQ
https://www.youtube.com/watch?v=nBATO0FCTEQ
Preventative in this case, not needed.
