The brief
The CLA180 had reached its major-service milestone. The owner had no specific complaints, just the schedule coming due. The major service covers the full set of consumables that ride the long interval: engine oil, transmission fluid, the brake fluid, all the filters, plus a full health inspection of the car.
That is the right way to treat a service like this. The fluids and filters are the routine part; the value is in the time on the ramp where the things that wear quietly get caught, the plugs, the brakes, the suspension, before any of them turns into a roadside problem or a warning light.
The diagnosis
The pre-service scan returned no stored faults, and the underbody and brake inspection came back clean.
The mileage and the service log called for the major-interval items: engine oil and filter, transmission fluid and filter, the engine air filter, the cabin filter, a brake-fluid flush, and a spark-plug check, which showed the plugs worn enough to be due for renewal.
The work
The engine oil was drained and refilled with the correct Mercedes-spec grade to volume, with a new oil filter. The transmission pan was dropped, the ATF filter replaced, a new pan gasket fitted, and the gearbox refilled with the correct ATF to level at temperature. The brake-fluid system was bled and refilled. New engine air and cabin filters went in, and a fresh set of spark plugs. The brake pads, discs, suspension and steering were inspected, the tyre pressures set, and the service interval indicator reset.
The outcome
The engine running smooth, the transmission shifting cleanly on the road test, and the brake pedal firm on the fresh fluid.
The CLA180 went home with the major interval signed off, nothing left hanging over it. For the owner that is the value of a thorough service: the oil, fluids, filters and plugs all dealt with in one organised visit, with a documented check of the rest of the car, rather than a quick oil change that leaves the real wear items for next time.
