GLS Class (X167) Produced 2020 to present

Engine replacement after 50K miles??

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Old Apr 21, 2025 | 11:30 AM
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Engine replacement after 50K miles??

Took in for clicking. Dealer says metal in oil, related to piston friction, acknowledged no reason it should have happened. Have gotten it services religiously at the dealer and no cause on our end. Obviously out of warranty, $30K to fix. MB USA doing nothing for us. Anyone heard of this? Any legal actions pending on this?
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Old Apr 21, 2025 | 11:45 AM
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Originally Posted by TreyL
Took in for clicking. Dealer says metal in oil, related to piston friction, acknowledged no reason it should have happened. Have gotten it services religiously at the dealer and no cause on our end. Obviously out of warranty, $30K to fix. MB USA doing nothing for us. Anyone heard of this? Any legal actions pending on this?
Which model? GLS450? Uncommon for the M256 3.0 inline-6 to blow up but it happens.

Mercedes is a low quality manufacturing company which means inconsistency from unit-to-unit.

Last edited by chassis; Apr 21, 2025 at 11:49 AM.
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Old Apr 21, 2025 | 11:48 AM
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Yes. And the fan went out on the central control panel which would require full replacement of that as well. All in $50K of service
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Old Apr 21, 2025 | 12:02 PM
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Another option is to call indy shops for a quote on a remanufactured engine.

For the same cash out of pocket it’s either that or a new CR-V.
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Old Apr 21, 2025 | 12:06 PM
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Originally Posted by TreyL
Took in for clicking. Dealer says metal in oil, related to piston friction, acknowledged no reason it should have happened. Have gotten it services religiously at the dealer and no cause on our end. Obviously out of warranty, $30K to fix. MB USA doing nothing for us. Anyone heard of this? Any legal actions pending on this?
Originally Posted by chassis
Which model? GLS450? Uncommon for the M256 3.0 inline-6 to blow up but it happens.

Mercedes is a low quality manufacturing company which means inconsistency from unit-to-unit.
Originally Posted by TreyL
Yes. And the fan went out on the central control panel which would require full replacement of that as well. All in $50K of service
What.... What year is this, first time hearing this on tbe M256.
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Old Apr 21, 2025 | 12:08 PM
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Actually, on a second thought, is this related? https://mbworld.org/forums/cls-coupe...e-failure.html
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Old Apr 21, 2025 | 12:14 PM
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There have been a small number of M256 grenades detonating posted on mbworld.
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Old Apr 21, 2025 | 12:32 PM
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Originally Posted by chassis
There have been a small number of M256 grenades detonating posted on mbworld.
No.
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Old Apr 21, 2025 | 01:03 PM
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Its a 2020 GLS 450. Not sure if it is the same engine
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Old Apr 21, 2025 | 01:09 PM
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Originally Posted by TreyL
Its a 2020 GLS 450. Not sure if it is the same engine
Please post your VIN.

It is either the M256 3.0 inline-6 or M276 3.0TTV6. Either way engine grenade @50k miles is uncommon, and possible for these engines.

If it was any of the current or past three or four MB four-bangers grenade would be the normal and expected ownership experience.
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Old Apr 21, 2025 | 01:20 PM
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GLS 450
4JGFF5KE0LA156919
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Old Apr 21, 2025 | 02:00 PM
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Originally Posted by chassis
Please post your VIN.

It is either the M256 3.0 inline-6 or M276 3.0TTV6. Either way engine grenade @50k miles is uncommon, and possible for these engines.

If it was any of the current or past three or four MB four-bangers grenade would be the normal and expected ownership experience.
Originally Posted by TreyL
M256
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Old Apr 21, 2025 | 03:20 PM
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Ebay has M256 engines for $15k. Assume $20k retail to consumer +$7k-$10k indy shop labor.

$30k out the door. Maybe some credit for a core return.

HVAC fan is probably a windshield-out and dash-out job. $10k is not out of the question.

Last edited by chassis; Apr 21, 2025 at 03:21 PM.
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Old Apr 21, 2025 | 04:01 PM
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GLS 450
Blue book on it doesn't justify it
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Old Apr 21, 2025 | 04:36 PM
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2021 GLS 450 & 23 GLS 450. Have a Holden Commodore, Jeep, truck, and more
How often were oil changes done?

How far out of warranty? Any offering of assistance from Mercedes to help cover this?
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Old Apr 21, 2025 | 04:49 PM
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2 years out of warranty. Serviced every service period completely with the dealer. No- they spent time discussing with MB USA and they decided to give us zip. We're done with Mercedes and will be a detractor whenever we can
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Old Apr 21, 2025 | 05:03 PM
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Originally Posted by TreyL
2 years out of warranty. Serviced every service period completely with the dealer. No- they spent time discussing with MB USA and they decided to give us zip. We're done with Mercedes and will be a detractor whenever we can
Sorry to hear that
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Old Apr 21, 2025 | 05:08 PM
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Originally Posted by TreyL
2 years out of warranty. Serviced every service period completely with the dealer. No- they spent time discussing with MB USA and they decided to give us zip. We're done with Mercedes and will be a detractor whenever we can
Sorry to hear. You have joined a large and growing group.
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Old Apr 21, 2025 | 06:24 PM
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Originally Posted by chassis
Sorry to hear. You have joined a large and growing group.
He's not in the Cayenne forum...... \
The group here is a lot smaller.

Last edited by mikapen; Apr 21, 2025 at 07:46 PM.
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Old Apr 21, 2025 | 07:23 PM
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Originally Posted by TreyL
2 years out of warranty. Serviced every service period completely with the dealer. No- they spent time discussing with MB USA and they decided to give us zip. We're done with Mercedes and will be a detractor whenever we can
can you be more specific to your oil change interval? Though it was done at the dealer was it done with the dealer schedule or did you do extra? Ultimately, we are wondering if 10,000+ mile oil changes might have contributed to another failed engine.

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Old Apr 21, 2025 | 08:46 PM
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2021 GLS 450 & 23 GLS 450. Have a Holden Commodore, Jeep, truck, and more
My questions as well. I've never been a fan of extended OCI's and have seen several engines fail that were changed exclusively at the longer OCI. Can't guarantee it, but the Independent Mercedes guy I know says if you plan to keep your vehicle you should be changing your oil by 5k miles and I have always done 5k or less on every vehicle I own. Many of these extended OCI's are done to reduce the "cost of ownership", but really aren't ideal.

I would be looking at finding an independent mechanic that specializes in Mercedes or is familiar with them to get a quote for these repairs. They should be considerably lower.
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Old Apr 21, 2025 | 08:50 PM
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Originally Posted by TreyL
We're done with Mercedes and will be a detractor whenever we can
That’s really sad……..Sorry to hear about all of that.
I agree thought, despite how much we love our GLS, I am not sure that our next SUV will be a Mbenz. They are not doing any thing to earn current owners confidence long-term. I’l enjoy it until the unlimited miles CPO warranty expires in 2-3 years. Will likely switch back to BMW with the inline-6 if they have a PHEV X7 by then.
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Old Apr 22, 2025 | 01:10 AM
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Originally Posted by S_W222
That’s really sad……..Sorry to hear about all of that.
I agree thought, despite how much we love our GLS, I am not sure that our next SUV will be a Mbenz. They are not doing any thing to earn current owners confidence long-term. I’l enjoy it until the unlimited miles CPO warranty expires in 2-3 years. Will likely switch back to BMW with the inline-6 if they have a PHEV X7 by then.
I wish the X7 had better legroom in the back. There was a rumor about a 3-row Porsche coming in 2027 but who knows if that will happen.
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Old Apr 22, 2025 | 06:55 AM
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Originally Posted by wildta
I wish the X7 had better legroom in the back. There was a rumor about a 3-row Porsche coming in 2027 but who knows if that will happen.
Porsche K1 project is stillborn. It was planned to be a 3-row electric super SUV. Volkswagen is revisiting electrification. No one wants an electric Porsche.
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Old Apr 22, 2025 | 08:38 AM
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Originally Posted by chassis
Porsche K1 project is stillborn. It was planned to be a 3-row electric super SUV. Volkswagen is revisiting electrification. No one wants an electric Porsche.
I don't know but at least I heard the electric Macan is seling pretty well.

I can tell not too much people like electric as shown with the Taycan depreciation and I guess it has software issues at some point but EVs depreciate rapidly anyways compared to ICE.

Last edited by W205C43PFL; Apr 22, 2025 at 08:39 AM.
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