GL63 AMG and GLS63 (X166, X167) 2014 - present (Two generations)

2018 GLS63 with 100k miles

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Old Nov 28, 2021 | 08:47 PM
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2020 Chevy Tahoe
2018 GLS63 with 100k miles

I am considering purchasing a one owner 2018 GLS63, it has regular well documented maintenance on CARFAX by a Mercedes’ dealer it’s whole life. It’s at a Chevy dealer currently presumably from a trade in.


the challenge is it is on the west coast and I am In the Midwest. Obviously I would have a Mercedes’ dealer do an inspection before considering. If the price is right, is this a great idea or a terrible idea?

Is there anything specific I should ask the dealer to look at as far as common problems? Is there anything pretty much guaranteed to go bad or major maintenance required at 100k or 120k miles I should factor in pricing? How is the longevity of the motor and transmission?

I’ve done some research and doesn’t seem like many people have put a ton of miles on these things so I appreciate any insight you all have.
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Old Nov 28, 2021 | 10:05 PM
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The 166 chassis is solid. This means body, suspension, interior and electrical. The M157/M278 engine is developing a reputation for cylinder scuffing, a fatal flaw. Do some research on this site regarding scuffing.
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Old Nov 28, 2021 | 10:37 PM
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Turbo coolant lines will need to be replaced soon if not already done. You will probably start having issues with the multi-contour seats. Pads and rotors will probably be in need of replacement. Various other issues are possibilities. Plugs will also need replacement soon. Budget around $5k in the next year or so in repairs/maintenance.
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