GL Class (X166) 2013-2015 after facelift became GLS (X166)

2014 GL450 spark plug replacement

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Old Jul 2, 2023 | 05:24 PM
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Mercedes Benz GL450 V8
2014 GL450 spark plug replacement

All, was seeking rough cost estimate these days to do M278 spark plug replacement.
I am considering doing it myself (fairly handy). I can get 8 plugs for $65. A 14mm thin wall magnetic swivel socket for $15.
I have the Torx set, the Dielectric grease, torque wrench, etc.

Have not gotten quotes for someone else to do, so seeking guidance here. I live in Colorado.

Thank you in advance and Happy 4th.
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Old Jul 2, 2023 | 06:00 PM
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just do it yourself, even if it takes all day it's a $600 job and it doesn't suck at all. Make sure you change your air filters, cabin filter annually too.

you're gonna want to torque them, Mercedes wants them within a 45 degree arc of the fuel injector.
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Old Jul 2, 2023 | 06:35 PM
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Mercedes Benz GL450 V8
per this document... https://automotivetechinfo.com/wp-co...nes-QEC-ES.pdf

Yep saw that. Video's look straight forward on how to do as well. Just gotta have the right tools.
This one looks pretty good of the entire process.

I was going to go with this set of spark plugs. I believe this is the OEM equivilant with thread length/indexing.

BOSCH 8 Piece Spark Plug Set - 0242140521, ZR6SII3320, 7430



It will cost me $100 and my time. Looks like a good weekend project..
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