Frequently asked questions about Engine oil
Read our FAQs about Engine oil. Find answers and practical tips from real CROP specialists. Have you read them? Continue to all Engine oil.
Is 5W-30 better for summer?
Not necessarily; 5W30 is suitable for both summer and winter when prescribed by the manufacturer. The number 5W refers to cold starts, and 30 to viscosity at high temperatures, which provides sufficient protection at normal summer temperatures.
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What does an engine with too little oil sound like?
An engine with too little oil often sounds rough, scraping or ticking. This happens because parts are not properly lubricated and rub directly against each other, which can also cause damage.
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Can the wrong oil damage a car?
Yes, the wrong oil can damage a car. It can lead to insufficient lubrication, overheating and accelerated wear, and in the worst case to engine failure.
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Can you use 5W-30 in every car?
No, you cannot use 5W-30 in every car. It is important that the oil matches the specifications and approvals of your car manufacturer, because engines differ in tolerances and additives.
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Is it better to use thicker oil in older engines?
Yes, in older engines, thicker oil can often be better. The higher viscosity of the oil provides a stronger oil film, which protects worn parts better against wear and leakage.
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Which is better, semi-synthetic or fully synthetic oil?
Fully synthetic oil is generally better than semi-synthetic oil because it lubricates more consistently, withstands high temperatures better and often offers longer change intervals. Semi-synthetic oil is fine for normal daily use, but fully synthetic oil protects your engine better under heavier loads or extreme temperatures.
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How long does 5W30 oil last?
5W30 oil usually lasts 10,000 to 30,000 kilometres, depending on the type of oil, engine and driving style. It is important to follow the oil interval stated by the manufacturer in the service booklet.
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Is 5W30 better for older cars?
Not necessarily; 5W30 is mainly suitable if the manufacturer prescribes it. For older engines, a slightly thicker oil such as 5W40 can sometimes be better because it seals better and protects worn parts.
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Is 5W40 better suited for older engines?
Yes, 5W40 is often better suited for older engines. The higher viscosity at warm temperatures provides a stronger oil film and better protection for worn parts.
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Is thicker oil better?
Thicker oil is not always better. Thick oil sometimes offers more protection at high temperatures or in older engines, but in modern engines with tight tolerances it can create more resistance and reduced lubrication.
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Is oil that is 10 years old still good?
No, oil that is 10 years old is usually no longer good. Long-term storage can cause oil to lose its lubricating and protective properties, so it no longer protects the engine or gearbox properly.
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How do I find out which oil goes in my car?
You can find out which oil your car needs by consulting the owner's manual or service booklet. It lists the viscosity, specifications and approvals suitable for your engine.
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Can I add 5W40 to 5W30?
No, it is not recommended to add 5W40 to 5W30. Mixing different viscosities and additives can cause the engine oil to lose properties, which may reduce engine lubrication and protection.
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Is more expensive engine oil better?
Not always: more expensive engine oil is not automatically better for your car. It may offer extra performance or longer change intervals, but the most important thing is that the oil has the correct specifications and approvals for your engine; that determines whether it is really better for your situation.
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What happens if you put the wrong oil in the car?
If you put the wrong oil in the car, lubrication may be insufficient and engine parts may wear faster. In the worst case, the wrong oil can lead to overheating, engine damage or complete engine failure.
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Can I just put any 5W30 oil in my car?
No, you cannot just use any 5W30 oil in your car. It is important that the oil meets the specifications and approvals of the car manufacturer, because engines differ in additives, tolerances and performance requirements.
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Is every 5W30 oil the same?
No, not every 5W30 oil is the same. The number only indicates viscosity; specifications, additives and approvals differ by brand and engine, so it is important to use the correct oil for your car.
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Which 5W30 engine oil is best?
The best 5W30 engine oil depends on your car and the specifications prescribed by the manufacturer. Always choose a 5W30 oil that matches the ACEA/API/brand approvals in your owner's manual, so you know the engine oil protects and performs properly.
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Which is better, 5W30 or 5W40?
Whether 5W-30 or 5W-40 is better depends on your engine and driving conditions. 5W30 is slightly thinner at high temperatures and often more economical, while 5W40 can offer more protection in warmer engines or under heavier loads; always follow the oil specification prescribed by your car manufacturer.
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How do you notice that you need to change oil?
You notice that oil needs changing when the engine or gearbox sounds strange, runs unevenly or when the oil is dark and dirty. Regularly checking colour, smell and viscosity helps determine when oil needs to be changed.
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