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Mercedes GLA Major Service at 136,000km: Engine Mount Found Cracked on Inspection

A Mercedes GLA came in for a major service at 136,000km. During the inspection we found a cracked engine mount and a coolant hose that needed attention. We sorted everything in one visit, quoted and approved before any work began.

Job completed: July 2026

White Mercedes GLA parked at our Singapore workshop ready for a major service

Job completed: July 2026. Last updated: August 2026. Written from our workshop job records and photos; technical details are generalised where the records do not confirm them.

CarMercedes-Benz GLA
SymptomDue for a major service at around 136,000km
Fault foundAll major service items due, plus a cracked engine mount and a coolant hose flagged on inspection
Repair doneFull major service including spark plugs, ATF and battery, plus engine mount replaced and coolant hose sorted
PartsOEM-grade parts throughout
Time takenTimeline confirmed when you book
CostEach item quoted and approved before work began
WarrantyRoad tested before handover

What the owner reported

The owner brought in a Mercedes GLA for a major service at around 136,000km. At this mileage, the car was due for a proper look-over rather than just an oil change. The owner wanted everything on the service schedule attended to and flagged any additional findings before work began.

This is exactly the right way to approach a high-mileage service on a car like the GLA. Mercedes engines are refined, quiet and capable, but they earn that character through proper maintenance. At 136,000km the oil, spark plugs, transmission fluid, brake fluid and battery are all in their service windows.

Worn engine mount from a Mercedes GLA showing deterioration, removed during a major service inspection at our Singapore workshop

The car

The Mercedes GLA is a compact SUV on the same platform as the A-Class; the exact engine and gearbox fitted vary by year and variant. It is a well-engineered, comfortable car that rewards careful maintenance.

At higher mileage, several items come due together. Spark plugs wear over tens of thousands of kilometres. ATF (automatic transmission fluid) degrades and should be changed to maintain smooth shifts. Brake fluid absorbs moisture and should be changed every two years or so. The battery weakens with age and Singapore's heat accelerates the process.

Engine mounts are rubber components that absorb the constant movement of the drivetrain. On a well-used car, they harden and crack over time. A cracked mount lets the engine rock under load, and the vibration travels through the car.

What we found on inspection

With the car on the lift, we worked through a full inspection alongside the service items.

The main finding beyond the service schedule was the engine mount. One of the mounts was cracked, confirmed by visual inspection and annotated with a photo sent to the owner. A cracked engine mount is a structural finding: it lets the engine rock under load, which stresses the drivetrain and sends vibration into the cabin.

We also found a coolant hose that needed attention. Coolant hoses on a high-mileage car harden and crack, and an unchecked hose can fail under pressure.

All findings were quoted separately and the owner approved the full scope before we started.

Engine mount from a Mercedes GLA showing a visible crack, photographed during inspection at our Singapore workshop

Why high-mileage Mercedes cars accumulate multiple service needs

At 136,000km, a Mercedes GLA has been through several years of Singapore's heat cycles and stop-start traffic. None of the findings here are unusual or a sign of poor care. They are what a well-maintained car accumulates over time when every service item is attended to on a proper schedule.

Spark plugs wear with every firing cycle and at this mileage they are simply overdue. ATF degrades with heat and use, and old transmission fluid produces rougher shifts over time. Brake fluid absorbs moisture from the air and its boiling point drops over the years, affecting brake performance in heavy use.

The engine mount failure is a straightforward rubber component that hardened and cracked with heat cycles. It is a normal wear item on a car at this mileage. Catching it on a scheduled service, rather than after it fails completely, is the right outcome.

What we did

We completed the full scope in one visit, working through each item in order.

  • Changed the engine oil and oil filter to Mercedes specification.
  • Cleaned the throttle body to restore smooth airflow.
  • Replaced all four spark plugs with OEM-grade parts.
  • Changed the ATF (automatic transmission fluid).
  • Changed the brake fluid.
  • Replaced the battery.
  • Replaced the cracked engine mount.
  • Attended to the coolant hose.
  • Road tested the car to confirm everything was settled before handover.

The owner collected the car and drove it for a few days, then came back briefly to have a rear sound rechecked. A short recheck confirmed nothing structural, and the car was cleared. This kind of thorough follow-through is part of what proper servicing looks like.

Mercedes GLA after a completed major service and engine mount replacement at our Singapore workshop

Before and after

Before

  • All major service items overdue at 136,000km
  • A cracked engine mount causing vibration under load
  • A coolant hose needing attention
  • Spark plugs, ATF and brake fluid all past their service windows

After

  • Full major service completed to Mercedes specification
  • New engine mount fitted, engine firm and vibration-free
  • Coolant hose sorted, cooling system secure
  • Fresh spark plugs, ATF, brake fluid and battery, road tested before handover

What a Mercedes GLA major service costs in Singapore

A Mercedes GLA major service in Singapore varies depending on what the car needs at its mileage. A routine service with oil and filters is at the lower end. When spark plugs, ATF, brake fluid, battery and an engine mount are added, the scope grows and the total reflects that.

On this car the full scope covered the complete major service plus the engine mount and coolant hose, each item quoted and approved before work began. We quote every item separately and only do what the owner approves.

How to keep a high-mileage Mercedes GLA in good shape

Service on schedule and keep the fluids current. Brake fluid should be changed every two years. ATF is often overlooked but it matters for smooth shifting on a dual-clutch or torque-converter automatic. Spark plugs should be changed at the manufacturer's recommended interval, not extended beyond it.

Get the engine mounts inspected at each major service. A cracked mount is easy to miss in daily driving but obvious on a lift. Catching it while the car is already in for a service avoids a separate visit later.

A Mercedes GLA at 136,000km with proper maintenance history is a genuinely good car. The service costs here are routine, not a symptom of a car falling apart. Keep the schedule and the car will continue to give good service.

About the workshop

This Mercedes-Benz GLA (Major service and engine mount replacement) was handled at 1 Car Service, an independent workshop in Sin Ming AutoCity, Singapore. For Mercedes-Benz, we use dealer-level XENTRY diagnostics. We hold a 4.9★ rating from 1,775+ Google reviews.

Signs your Mercedes needs a service or engine mount check

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Mercedes GLA major service: common questions

How much does a Mercedes GLA major service cost in Singapore?

It depends on what the car needs at its mileage, so we quote each item individually after inspection. A routine oil-and-filter service is at the lower end. Adding spark plugs, ATF, brake fluid, battery and an engine mount brings it to the higher end. We quote every item separately and only do what you approve.

How often should I change the ATF on a Mercedes GLA?

The change interval depends on the exact gearbox fitted, so we go by that gearbox's own schedule rather than one blanket figure, and we do not treat any fill as a lifetime fill. Old ATF produces rougher shifts and accelerates wear inside the transmission. At 136,000km, a GLA's ATF is due for a change regardless of when it was last done.

What does a cracked engine mount feel like to drive?

A cracked engine mount typically produces a vibration through the cabin under acceleration, a slight shunt feeling when pulling away, and sometimes a thud or clunk when engaging drive or reverse. It can feel like something is loose under the car. A proper inspection confirms it.

Why change spark plugs on a Mercedes GLA?

Spark plugs wear over tens of thousands of kilometres. Worn plugs misfire, cause rough idling, reduce power and increase fuel consumption. On a Mercedes turbocharged engine, keeping plugs fresh is important for clean combustion and protecting the catalytic converter.

Do I need a Mercedes main dealer to service my GLA?

No. Using the correct oil spec, the right parts, and Xentry-compatible diagnostic tools is what matters for a Mercedes service. We service Mercedes vehicles with the specified oil and OEM-grade parts, and inspect before quoting so there are no surprises at collection.

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