Pre-Purchase Inspection Checklist

2018 Mercedes-Benz GLC pre-purchase inspection checklist

What to check before you buy, built from NHTSA recall data, owner-reported failures, and mechanic intel. Print it or bring it to your mechanic.

Pre-purchase inspection · 2018 Mercedes-Benz GLC
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2018 Mercedes-Benz GLC
GLC 300 / GLC 300 4MATIC / GLC 43 AMG (X253, 2016-2022)
High Attention

X253 GLC is one of the most popular luxury compact SUVs in the world — quality is genuine and the interior is excellent. Same maintenance concerns as the C-Class: 9G-Tronic fluid service, sunroof drain clogs, and M274 timing chain. Mercedes specialist PPI with XENTRY scan before purchase is mandatory. Budget $3,000–$5,000/year honestly.

Items to check
13
Open recalls
1
NHTSA complaints
145
Top concern
Sunroof drain clogs / 9G-Tronic fluid / M274 timing / high maintenance costs

Powertrain

M274 2.0T timing chain concern (early builds)

Monitor
Early M274 timing chain adjuster can wear — listen for cold-start rattle.
Cold-start the engine and listen for sustained rattle.
Est. cost: $1,200–$2,800 timing chain Source: M274 pattern

9G-Tronic fluid service

High Attention
9G-Tronic 9-speed is marked as lifetime fluid by Mercedes but benefits from service at 60k–80k miles.
Test all driving scenarios for shudder or hesitation.
Est. cost: $400–$700 fluid service / $3,500–$6,000 transmission Source: Independent Mercedes consensus

Body

Panoramic sunroof drain clog

High Attention
Sunroof drains clog on X253 — water enters A-pillar or door sills.
Check headliner at A-pillar and door sills for water stains.
Est. cost: $150–$400 drain cleaning / $1,500–$3,000 water damage repair Source: GLC well-known issue

Electrical

COMAND infotainment faults

Monitor
COMAND faults require XENTRY scan.
PPI with XENTRY at Mercedes specialist.
Est. cost: $150–$250 PPI / $300–$3,000+ faults Source: Mercedes pre-purchase standard

Suspension

Front control arm wear

High Attention
GLC control arms wear at 60k–80k miles.
PPI suspension inspection.
Est. cost: $800–$2,000 front suspension refresh Source: X253 common repair

Documentation

Mercedes specialist PPI — mandatory

Critical
XENTRY scan reveals all hidden fault codes before purchase.
$150–$250 PPI. Non-negotiable.
Est. cost: $150–$250 PPI Source: Mercedes ownership standard

NHTSA Recalls (verify completion via VIN)

Multiple
Open recalls — VIN check
Campaigns vary by build date. Run the VIN at nhtsa.gov/recalls and require every open recall closed before purchase.
After you buy: common DIY repair guides
Planning the upkeep this car will need? Our step-by-step guides cover oil changes, brake pads & rotors, battery replacement, transmission fluid, coolant flushes, and spark plugs — each with the tools, parts, torque specs, and common mistakes that matter. Browse all repair guides →

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