Engine Oil: The lifeline of your car
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By Theodore Opara
Engine oil is to a vehicle what blood is to the human body – essential for survival. Beyond keeping the engine running smoothly, it lubricates moving parts, reduces friction, and prevents overheating. Without it, even the most advanced automobile will quickly grind to a halt.
Engine oils come in different grades and formulations, depending on engine design and age. Older vehicles typically use lower-grade oils as specified by manufacturers, while modern engines require more advanced options such as semi-synthetic or fully synthetic oils. Common grades include 5W-20, 5W-30, 10W-40, and 0W-20.
Choosing the correct oil is critical, as each engine is built to perform optimally with a specific type.
From the moment oil is poured into an engine, it begins to work – lubricating components, reducing heat, and cleaning internal parts.
Whether the car is driven or not, the oil starts to degrade over time, much like detergent begins cleaning fabric immediately it is applied. Gradually, the oil loses its effectiveness and must be replaced.
Several factors influence how long engine oil lasts, including driving habits, engine type, climate, and mileage.
What engine oil does
Engine oil ensures smooth operation by lubricating moving parts and minimizing wear. It also cools the engine, prevents corrosion, and traps dirt and debris, which are then filtered out.
Without proper lubrication, an engine can overheat, seize, or suffer irreversible damage. Maintaining the right oil level and changing it on schedule is therefore essential.
When to change your engine oil
For most modern vehicles using semi-synthetic or fully synthetic oil, changes are recommended every 5,000 to 7,500 kilometres, or every 6 to 12 months. Some vehicles can go longer – up to 10,000 to 15,000 kilometres – depending on manufacturer specifications.
However, climate and driving conditions play a major role. In hot environments or heavy traffic conditions, oil tends to degrade faster.
The quality of the oil filter is equally important, as a poor filter can fail prematurely and allow harmful particles into the engine.
Older vehicles using conventional oil typically require more frequent changes – around 3,000 to 5,000 kilometres.
Frequent short trips, stop-and-go driving, extreme temperatures, or towing also demand more regular oil changes. Even if a vehicle is rarely used, oil should still be changed at least two to three times a year, as it naturally deteriorates over time. When in doubt, 5,000 kilometres remains a safe benchmark.
Signs your car needs oil change
•Warning light on the dashboard
•Engine noise or knocking sounds
•Dark, thick, or gritty oil
•Burning oil smell inside the car
•Blue or grey exhaust smoke
•Excessive mileage since last change
•Engine vibrations while idling
•Oil spots under the vehicle.
Regularly checking oil with a dipstick can help detect problems early and prevent costly damage.
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