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Neglect maintenance and problems pile up: fuel consumption rises, and the car may start leaking oil. Watching the gauge drop day after day is painful. The answer is to find the leak and stop it.
1. Sump leak
The drain plug works loose or is damaged, and its washer provides the seal. Replace that washer on the service schedule, and tighten or replace the drain plug. A leak at the sump gasket means the gasket has aged or is poor quality: drop the sump and replace it, or seal the leak point.
2. Shock absorber leak
The simple test is to press the body down firmly and release. If the car settles within two or three bounces the dampers are working; if it keeps rocking, they are worn. If a damper is leaking, replace it.
3. Brake fluid seepage
Check whether the wheel cylinder seal has aged or failed; if so, replace it. Confirm the brake fluid meets specification, and replace anything substandard or counterfeit.
4. Oil seal leaks
Front and rear crank seals and camshaft seals harden with age. A leak here shows as oil on the engine or under the car; replace the seal rather than topping up.
5. Fuel line and injector leaks
Check the fuel lines and injector seals for seepage and a fuel smell. Fuel leaks are a fire risk: deal with them immediately.