Choosing engine oil does not have to be confusing. Three things matter most: the viscosity grade, the oil type, and the approval or specification your manufacturer asks for.
1. Check your owner's manual first
Your owner's manual (or the sticker under the bonnet or on the oil filler cap) lists the recommended viscosity, such as 5W-30 or 5W-40, and the specification the oil must meet. Always follow it, especially for cars still under warranty.
2. Understand the viscosity grade
In a grade like 5W-30, the number before the W (winter) shows how well the oil flows when cold. The lower it is, the easier the engine starts on a cold morning. The second number shows how thick the oil stays at operating temperature.
3. Mineral, semi-synthetic or full synthetic
Mineral oils suit older, simpler engines. Semi-synthetic oils are a step up for everyday driving. Full synthetic oils resist heat and breakdown better and are commonly required by modern turbo and European engines.
4. Petrol or diesel
Some oils are made for diesel engines, particularly those with a diesel particulate filter (DPF). Check the label matches your engine.
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