How to Change Your Car Oil Step by Step

Most modern manufacturers recommend changing the oil every 10,000–15,000 km or once a year, whichever comes first. However, if you drive in severe conditions (city driving, extreme cold, towing), the interval drops to 5,000–7,500 km.

Signs you need an urgent change:

• Level below the minimum on the dipstick
• Black, thick oil (healthy: amber or light brown)
• Oil warning light on the dashboard
• Rattling noise on cold start
• Burning smell in the cabin

Have everything ready before you start:

• New oil — Correct quantity (usually 4–6 L) and viscosity from your manual: 5W-30, 5W-40, 0W-20, etc.
• New oil filter — Quality brands: Mann, Bosch, Mahle. Cheap filters can fail within days.
• Socket wrench — For the drain plug (commonly 14, 17 or 19 mm).
• Oil filter wrench — Adjustable or engine-specific.
• Hydraulic jack + axle stands — Never work under a car supported only by a jack.
• Drain pan — Minimum 8-litre capacity.
• Funnel, rags, nitrile gloves
• New copper washer — For the drain plug (~50p, prevents leaks).

Using the wrong oil can seriously damage your engine:

• Viscosity: The SAE code (5W-30, 0W-40…) is chosen by the manufacturer. Don't change it arbitrarily.
• Base: Mineral (cheaper, older engines), semi-synthetic (balanced), or fully synthetic (best protection, modern engines).
• Specification: Look for the ACEA rating (A3/B4, C3…) and manufacturer approval (VW 504.00, BMW LL-04, Dexos…).

Reliable brands: Castrol Edge, Mobil 1, Liqui Moly, Shell Helix Ultra, Total Quartz.

Follow this exact order:

1. Drive the car 5–10 minutes to warm the oil to ~60°C — it flows better and carries more deposits.
2. Park on a flat, firm surface.
3. Turn off the engine and wait 5 minutes.
4. Apply the handbrake and place wheel chocks on the rear wheels.
5. Open the bonnet and remove the oil filler cap to allow proper drainage (prevents a vacuum).
6. Raise the car with the hydraulic jack at the marked jacking points and place axle stands.

The most important phase:

1. Position the drain pan under the sump.
2. Locate the drain plug (bottom of the oil pan).
3. Loosen with the socket wrench counter-clockwise. Finish by hand to control the plug.
4. Let it drain for 10–15 minutes.
5. Observe the oil: excessive foam may indicate coolant contamination; metallic particles indicate engine wear.
6. Clean around the drain plug seat with a rag.

The filter traps metal particles, carbon, and contaminants. Never reuse it:

1. Locate the filter — cartridge type (plastic housing) or spin-on type (metal canister).
2. Use the filter wrench to turn counter-clockwise.
3. Empty the old filter into the drain pan. Clean the filter seating surface on the engine.
4. Lightly oil the rubber gasket of the new filter with clean oil.
5. Screw in by hand until the gasket contacts the surface, then tighten 3/4 turn more. Do NOT use a wrench to tighten — you'll deform the gasket.

The final phase before starting:

1. Reinstall the drain plug with a new copper washer and tighten to the correct torque (typically 20–30 Nm).
2. Lower the car from the stands.
3. Using a funnel, pour in 80% of the total specified quantity first.
4. Replace the oil filler cap, start the engine and let it idle for 30 seconds. Check for leaks underneath.
5. Turn off the engine and wait 3 minutes for oil to drain back into the sump.
6. Check the level with the dipstick: remove, wipe, insert fully, remove. The level should be between min and max, ideally in the upper third.
7. Add small amounts until you reach the correct level.

Used engine oil is hazardous waste. It is illegal to pour it down drains, into soil, or in general waste bins:

• Store it sealed in the original oil container.
• Take it to a local recycling centre or any garage (they are required to accept it free of charge).
• One litre of used oil can contaminate 1 million litres of groundwater.