# Maintenance (cars)
### 1. Fluid Levels (Under the Bonnet)

- **Oil level:** You check this using a dipstick. Without enough oil, the engine will create too much friction and destroy itself.
    
- **Coolant level:** This liquid flows around the engine to absorb heat. If the level is too low, the engine will overheat.
    
- **Windscreen washer fluid:** (This is the correct term for your "mixture of windshield wipers"). It is a mixture of water and antifreeze or cleaning chemicals used to keep the windscreen clear.
    

### 2. Wheels and Tyres

- **Tyre pressure:** You must check if the pressure matches the manufacturer's manual.
    
- **Overinflated (Overpressured) tyres:** If there is too much air, the tyre wears out unevenly in the centre and the car has less grip on the road.
    
- **Underinflated tyres:** If there is not enough air, the car consumes more fuel and the tyre wears out on the edges.
    

### 3. Engine Maintenance

- **Air filter:** It prevents dust and dirt from entering the engine. If it gets clogged, the engine cannot "breathe" properly and loses performance.
    
- **Spark plug condition:** Over time, spark plugs get dirty or worn out. If they are in bad condition, the combustion (expansion) stroke will misfire or the car will not start at all.
    

### 4. Exterior Safety

- **Lights:** You should regularly check if all exterior lights are working. This includes headlights, indicators (blinkers), brake lights, and reverse lights.
    

**How to use this at the exam:**

You can easily link this to the 4-stroke engine topic. Start by explaining how the engine works, and then say: _"To keep this engine running smoothly, you need to do regular maintenance..."_ and just list these four categories. It sounds highly professional and easily fills up the required speaking time.