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GLS Spark Plugs replacement - discussion

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Old Jul 12, 2025 | 03:11 PM
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GLS Spark Plugs replacement - discussion
My Mercedes dealership wants 1200 to replace the six spark plugs on my GLS

I think it’s quite high given how easy it is to access those on the in-line six.

I’m thinking of replacing those myself can someone share the service notes for the X167 inline-6? Also what would the cost be at an indy shop?
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Old Jul 13, 2025 | 08:04 AM
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Originally Posted by S_W222
My Mercedes dealership wants 1200 to replace the six spark plugs on my GLS

I think it’s quite high given how easy it is to access those on the in-line six.

I’m thinking of replacing those myself can someone share the service notes for the X167 inline-6? Also what would the cost be at an indy shop?
That is on the high side but spark plugs already Is that a little too early
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Old Jul 13, 2025 | 01:41 PM
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Originally Posted by W205C43PFL
That is on the high side but spark plugs already Is that a little too early
We drive this yacht as it should, for all our road trips. We’ve already hit 49,950 miles just yesterday also on a road trip. Good thing is that I have an unlimited miles extended warranty / CPO covered until mid 2027.
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Old Jul 13, 2025 | 02:26 PM
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Originally Posted by S_W222
My Mercedes dealership wants 1200 to replace the six spark plugs on my GLS

I think it’s quite high given how easy it is to access those on the in-line six.

I’m thinking of replacing those myself can someone share the service notes for the X167 inline-6? Also what would the cost be at an indy shop?
You should skim thru this thread. It's pretty informative.
https://mbworld.org/forums/gls-class...g-harness.html
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Old Jul 13, 2025 | 07:49 PM
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Originally Posted by S_W222
We drive this yacht as it should, for all our road trips. We’ve already hit 49,950 miles just yesterday also on a road trip. Good thing is that I have an unlimited miles extended warranty / CPO covered until mid 2027.
Oh that makes a lot of sense then glad you are enjoying it.
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Old Jul 14, 2025 | 05:21 PM
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2015 MB S550 & 2020 MB GLS 450
Originally Posted by S_W222
My Mercedes dealership wants 1200 to replace the six spark plugs on my GLS

I think it’s quite high given how easy it is to access those on the in-line six.

I’m thinking of replacing those myself can someone share the service notes for the X167 inline-6? Also what would the cost be at an indy shop?
As another data point: Had my 50k service at end of May and included, wiper blades, engine air filter, and spark plugs at $1,066.
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