How to Change Your Engine Oil: A Complete DIY Guide 2026

On average, you should change your engine oil every 15,000 km or once a year, regardless of the mileage covered. Simply topping off the oil when the level drops and only rarely performing a full replacement is a mistake because used oil does not benefit from the addition of new oil.

Every two oil changes, it is also advisable to replace the filter, which by that point can no longer perform its job perfectly. This replacement is done with the engine warm so that the old oil is fluid and drains completely. The type of oil to use can be found in your vehicle's manual.

Different Viscosities

Lubricating oils have different viscosities, and within the same oil, this varies depending on temperature. Viscosity is indicated by a number ranging from 10 to 50, preceded by the acronym SAE (Society of Automotive Engineers): the higher the number, the greater the viscosity. "Multigrade" oils, with variable viscosity, are very common and are defined by two numbers. A classic multigrade is SAE 20 W 50. This indicates that the oil has a low viscosity in winter, like an SAE 20, while its viscosity rises at high temperatures, like an SAE 50.

When the engine temperature increases, oil tends to become more fluid and lose its lubricating properties. For this reason, an increase in viscosity compensates for the tendency to become too thin. It is convenient to use a multigrade oil like SAE 20 W 50 or SAE 15 W 40, which are suitable for most temperatures and normal driving conditions.

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What You Need to Change Engine Oil

• Motor oil
• Chain wrench
• Oil filter
• Drain pan
• Funnel
• Rags

Time required: 1 hour

Checking the Level

To accurately check the oil level, we must first clean the dipstick, reinsert it, and pull it out again. The car must have been off for a few minutes and parked on level ground.

Draining the Oil Pan

To drain the oil pan, unscrew the bottom plug with a suitable wrench (avoid makeshift solutions). Leave the top cap open and place a wide, shallow container under the pan.

Replacing the Seal Gasket

Before pouring new oil into the filler neck, reinstall the screw cap, tightening it fully. If the gasket is worn, replace it with a new one to prevent leaks.

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Refilling with New Oil

Using a funnel, pour in the correct amount and type of oil as specified in your owner's manual. Check the level with the dipstick and add more if necessary.

Disposing of Old Oil

Never pour used oil down the drain. Collect it in a sealed container and take it to a recycling center or auto parts store that accepts used oil.

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FAQ

How often should I change my oil?

Most manufacturers recommend every 5,000 to 7,500 miles (8,000 to 12,000 km), but check your owner's manual for specific intervals.

Can I use any oil filter?

No, always use a filter that matches your car's make and model. Using the wrong filter can cause leaks or poor filtration.

What happens if I overfill the oil?

Overfilling can cause foaming, increased pressure, and potential engine damage. Always check the level after adding oil.

Is synthetic oil better than conventional?

Synthetic oil offers better performance at extreme temperatures and longer intervals, but it costs more. Check if your engine requires it.

Do I need to warm up the engine before draining?

Yes, warm oil flows more easily and drains more completely, but be careful not to burn yourself. Let it cool slightly if the engine is hot.

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Final Tips for a Successful Oil Change

• Always use a new crush washer on the drain plug to prevent leaks.
• Mark your oil change date and mileage on a sticker inside the windshield.
• Keep a record of the oil type and filter used for future reference.
• If you're unsure about any step, consult a professional mechanic.

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