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2018 Mercedes Benz Gla Class Maintenance Schedule

Manufacturer-recommended service intervals for the ASSYST Plus (Service A / Service B) and open recall alerts for your 2018 Mercedes Benz Gla Class.

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RecallsFull scheduleKnown issues8

How Mercedes-Benz schedules service: ASSYST Plus (Service A / Service B)

Mercedes-Benz alternates two service events: Service A (oil, filter, inspection) at roughly 10,000 miles or 1 year, then Service B (Service A plus brake fluid, cabin filter, and deeper checks) at roughly 20,000 miles or 2 years — the ASSYST Plus counter in the cluster tells you which is due. Oil must carry the MB-Approval number your engine specifies (commonly 229.5, or 229.71 for newer 0W-20 engines); 'meets or exceeds' marketing language is not an approval. Electric EQB and EQS models keep the A/B rhythm for inspections, brake fluid, and cabin filters — just without oil.

Essential maintenance

Critical for safety and preventing major damage

🛢️

Service A — Oil & Filter + Inspection

Every 10,000 mi

Every 10,000 miles or 12 months: oil and filter with MB-Approved oil, fluid top-offs, tire check, and inspection. AMG models driven hard: many owners service at 5,000-7,500 miles.

Estimated cost — typical U.S. ranges

Dealer

~$120–$160

Shop

~$85–$115

DIY

~$25–$55

Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.

🔍

Service B — Major Inspection

Every 20,000 mi

Every 20,000 miles or 2 years, alternating with Service A: everything in A plus brake-fluid replacement, cabin filter, and a deeper multi-point inspection of brakes, suspension, and driveline.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Most shops do this free with any paid service. A flashlight and 10 minutes covers the basics yourself.

🔄

Tire Rotation

Every 10,000 mi

Rotate at every Service A where the tire sizes allow. Many AMG and 4MATIC+ models run staggered widths that can't rotate front-to-rear — check your spec before paying for a rotation.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Often free at the shop where you bought the tires — worth asking before paying.

🛑

Brake Inspection

Every 10,000 mi

Checked at every A/B service via electronic pad-wear sensors. Replace sensors with pads. Heavy EQS models wear pads slowly (regen braking) but rotors can corrode from disuse — an inspection catches that.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.

🧪

Brake Fluid

Every 20,000 mi

Replaced every 2 years as part of Service B — Mercedes schedules it on time, not miles, because DOT 4 fluid absorbs moisture regardless of driving.

Estimated cost — typical U.S. ranges

Dealer

~$180–$200

Shop

~$125–$140

DIY

~$10–$25

DOT 3 or 4 — match the cap. Vacuum bleeders make this a one-person DIY.

Important maintenance

Keeps your vehicle running smoothly and efficiently

⚙️

Automatic Transmission Fluid (7G / 9G-Tronic)

Every 70,000 mi

Mercedes specifies fluid and filter service around 70,000 miles on most 7G- and 9G-Tronic gearboxes — check your year's sheet. Use only the MB-spec fluid for your transmission code; independent specialists often service at 60,000 on hard-driven cars.

Estimated cost — typical U.S. ranges

Dealer

~$330–$500

Shop

~$235–$355

DIY

~$60–$180

Some sealed transmissions have no dipstick — fill is precise and best left to a shop. Many drivers can still DIY drain-and-fill.

⚡

Spark Plugs

Every 60,000 mi

Most modern MB gas engines: plugs around 60,000 miles — AMG engines often sooner. Check your engine's sheet; twin-turbo V8 plug jobs are labor-heavy, so pair with other scheduled work.

Estimated cost — typical U.S. ranges

Dealer

~$285–$390

Shop

~$200–$275

DIY

~$25–$100

Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.

💨

Engine Air Filter

Every 40,000 mi

Replace around every 40,000 miles (twin-filter setups on V6/V8 engines double the parts bill). Inspected at every Service B.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

5-minute job on most cars; the airbox lid usually has clips, no tools needed.

Recommended maintenance

Extends the life of your vehicle and improves comfort

🌬️

Combination / Dust Filter

Every 20,000 mi

Replaced with every Service B. Models with the ENERGIZING air package use a higher-grade filter — priced accordingly.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.

🌡️

Engine Coolant

On condition / lifetime

MB-spec coolant is long-life (typically ~10 years / 150,000 miles on the sheet). Refresh only with MB 325/326-spec coolant — the wrong chemistry attacks aluminum and head gaskets.

Estimated cost — typical U.S. ranges

Dealer

~$285–$330

Shop

~$200–$235

DIY

~$25–$60

Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.

🔋

12V & Auxiliary Battery

Every 25,000 mi

Test annually after year 3. Most modern Mercedes carry a second auxiliary battery; a weak one triggers cascading warning messages long before a no-start. EQ models also depend on the 12V system to boot.

Estimated cost — typical U.S. ranges

Dealer

~$225–$390

Shop

~$160–$280

DIY

~$130–$250

Most auto-parts stores test and install batteries free with purchase. Skip the dealer markup.

Known issues for this vehicle

What drivers and federal regulators have officially reported about the 2018 Mercedes Benz Gla Class.

Reported to NHTSA

Crankcase ventilation valve fault (P052E)

ENGINE

8 NHTSA complaints · 2024-04 → 2026-06

“Why is the Crankcase Ventilation System P052E Code (PCV) covered in most Mercedes models, but not the GLA? This is an expensive repair that seems to cover other cars but penalizes GLA owners just to have a safe car to drive like the other models…”
— Owner report, NHTSA ODI #11720771
“The contact owns a 2018 Mercedes-Benz GLA250. The contact stated while driving at various speeds and attempting to accelerate, the vehicle hesitated and jerked abnormally before accelerating. The contact stated that the failure also occurred while accelerating from the vehicle…”
— Owner report, NHTSA ODI #11634672

Read all complaints on NHTSA →

Instrument cluster and electrical display failures

ELECTRICAL SYSTEM

6 NHTSA complaints · 2022-11 → 2026-06

“The instrument cluster would fail intermittently, the speedometer would be my accurate speed, and then suddenly 0. Same for RPMs, gas, etc. Then after a period of time they would work again. Some times is was just oscillating back and forth between the failure modes…”
— Owner report, NHTSA ODI #11746825
“My vehicle electrical panel is messed up can not read the driver panel the sunroof electrical also is not working the driver seat chair electrical stopped working and ever since the sunroof n chair started giving me issues my front panels started to go haywire…”
— Owner report, NHTSA ODI #11684208

Read all complaints on NHTSA →

Panoramic sunroof glass shatter and panel detachment

STRUCTURE, UNKNOWN OR OTHER

4 NHTSA complaints · 2021-10 → 2026-07

“Sunroof glass exploded without warning while driving at highway speed. Glass shards poured throughout the vehicle including on the driver, potentially putting the vehicle and other vehicles in danger.”
— Owner report, NHTSA ODI #11748081
“While driving the vehicle on the highway the front panel immediately in front of the panoramic roof was ripped off. The glue holding the panel in place was defective and is a known issue that currently has a recall out issued by Mercedes Benz…”
— Owner report, NHTSA ODI #11487062

Read all complaints on NHTSA →

Sunroof failure to close and water leak

VISIBILITY

3 NHTSA complaints · 2024-07 → 2025-10

“The contact owns a 2018 Mercedes-Benz GLA250. The contact stated that the rear passenger’s side of the sunroof had raised up, causing the sunroof to fail to close properly. The vehicle had been taken to a certified mechanic who informed the contact that the sunroof needed…”
— Owner report, NHTSA ODI #11605188
“to a sunroof bonding issue that could cause water leakage”
— Owner report, NHTSA ODI #11668964

Read all complaints on NHTSA →

Rear differential and rear-end noise

POWER TRAIN

4 NHTSA complaints · 2017-10 → 2025-07

“Rear differential is faulty. This is the second time it has failed. The first time was in October 2021 the mileage was 44,812 and it was repaired. More recently it was making a noise and I took it back to Mercedes Benz dealership for repair…”
— Owner report, NHTSA ODI #11673669
“THE PROBLEM IS WHEN TRAVELLING AT LOW SPEEDS OR STOP THE CAR TO HALT ABLE TO HEAR A NOISE FROM THE REAR END. LIKE A METAL HITTING ANOTHER METAL. IT HAS BEEN ONLY 1 MONTH I BOUGHT THE CAR AND 1300MILES ON IT…”
— Owner report, NHTSA ODI #11040373

Read all complaints on NHTSA →

Transmission shift to neutral and power loss

POWER TRAIN

6 NHTSA complaints · 2022-07 → 2025-09

“I was driving on the freeway and the transmission shifted into neutral and the car lost power. The Red malfunction lights came on and said transmission malfunction, DO NOT SHIFT, STOP driving immediately, contact dealer. There is a class action lawsuit and a RECALL…”
— Owner report, NHTSA ODI #11625915
“The contact owns a 2018 Mercedes-Benz GLA250. The contact stated while driving 25 MPH, the transmission unintendedly shifted to neutral. No warning light was illuminated; however, the message "Transmission Error" was displayed on the instrument panel…”
— Owner report, NHTSA ODI #11622356

Read all complaints on NHTSA →

Fuel odor in cabin and fuel leak

FUEL/PROPULSION SYSTEM

4 NHTSA complaints · 2023-03 → 2025-02

“There was a gas smell that would seep into the driving cabin from the engine. It was intermittent however when it did occur, the smell was strong enough to cause light headedness to the occupants of the vehicle. I took the car to my personal mechanic…”
— Owner report, NHTSA ODI #11645071
“The contact owns a 2018 Mercedes-Benz GLA250. The contact stated that while driving at an undisclosed speed, the vehicle stalled. There were no warning lights illuminated. The contact stated that there was a fuel odor coming from the vehicle…”
— Owner report, NHTSA ODI #11644599

Read all complaints on NHTSA →

Airbag warning light and clockspring fracture

AIR BAGS

4 NHTSA complaints · 2018-04 → 2023-03

“The contact owns a 2018 Mercedes-Benz GLA250. The contact stated that the air bag warning light was illuminated. The vehicle was taken to the local dealer where it was diagnosed that the clockspring in the steering column was fractured and made inoperable…”
— Owner report, NHTSA ODI #11509710
“TL* THE CONTACT OWNS A 2018 MERCEDES-BENZ GLA250. THE CONTACT RECEIVED NOTIFICATION OF NHTSA CAMPAIGN NUMBER: 17V627000 (AIR BAGS); HOWEVER, THE PART TO DO THE REPAIR WAS UNAVAILABLE…”
— Owner report, NHTSA ODI #11083398

Read all complaints on NHTSA →

Issues on other model years

  • 2015 Mercedes Benz Gla Class →
  • 2016 Mercedes Benz Gla Class →
  • 2017 Mercedes Benz Gla Class →
  • 2019 Mercedes Benz Gla Class →
  • 2020 Mercedes Benz Gla Class →
  • 2021 Mercedes Benz Gla Class →

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Jul 27, 2026. Investigation data refreshed Jul 27, 2026.

We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.

Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.

How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.

This maintenance schedule for the 2018 Mercedes Benz Gla Class reflects Mercedes-Benz's published service intervals and the ASSYST Plus (Service A / Service B) system. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.

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