Frequently asked questions about Fuel and engine additives
Read our FAQs about Fuel and engine additives. Find answers and practical tips from real CROP specialists. Have you read them? Continue to all Fuel and engine additives.
What is a fuel additive?
A fuel additive is an additive for petrol or diesel that improves engine performance or prevents problems. A fuel additive can, for example, clean injector deposits, improve fuel stability or reduce corrosion.
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How often should you add an additive?
How often you add a fuel additive depends on the type of additive and the manufacturer's recommendations. It is often advised to add it with every fill-up or every few thousand kilometres to keep the fuel system clean and efficient.
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Are fuel additives just snake oil?
No, fuel additives are not snake oil, but their effect depends on the engine type and the problem. Some additives clean injectors, reduce soot formation or protect against corrosion, while others have little noticeable effect when regular maintenance is already carried out.
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What is the best additive for petrol?
The best additive for petrol is one that cleans injectors and your fuel system and helps reduce deposits for smoother operation. Choose an additive that is best for petrol engines, compatible with your car and well reviewed by other users or manufacturers.
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Which additives should I avoid?
You should avoid additives that are not suitable for your engine or fuel type. Also avoid products with aggressive solvents or unclear ingredients, because they can damage injectors, seals or catalytic converters.
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How often should you use fuel system cleaner?
You can usually use a fuel system cleaner every 3,000 to 5,000 kilometres, depending on the manufacturer. Regular use of fuel system cleaner keeps injectors and valves clean and prevents loss of power.
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Is petrol cleaner good for a car?
Yes, petrol cleaner is good for a car when used according to the instructions. Petrol cleaner helps keep injectors, valves and fuel systems clean, allowing the engine to run more efficiently and reducing wear.
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How do I know if I need a fuel additive?
You may need a fuel additive if you notice the engine running roughly, having less power or starting poorly. A fuel additive can also be useful with old fuel, long periods of inactivity or to keep injectors clean.
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What is the best fuel system cleaner for petrol?
The best fuel system cleaner for petrol is a product that cleans injectors, valves and lines. Good choices include Wynn's, 5in1 and Liqui Moly Injector Cleaner, which effectively remove deposits and keep the engine running smoothly.
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Can you use too much fuel system cleaner?
Yes, you can use too much fuel system cleaner. Concentrations that are too high can damage seals, gaskets or catalytic converters, so always follow the manufacturer's recommended dosage.
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Is petrol cleaner good for my car?
Yes, petrol cleaner is good for your car when used correctly. Petrol cleaner keeps injectors, valves and the fuel system clean, which helps the engine run more smoothly and reduces wear.
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Is octane booster good for your car?
Yes, an octane booster can be good for your car if you experience pinging or knocking in the engine. Octane booster raises the fuel's octane rating, resulting in better combustion and less knocking, especially under high load or in older engines.
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Which octane booster is best?
The best octane booster is one that effectively raises the octane rating without harmful by-products, such as brands with good reviews for petrol engines. Choose an octane booster compatible with your engine and fuel system, and always follow the dosage on the packaging for optimal results.
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How much octane booster?
Use octane booster according to the dosage on the packaging, usually a fixed amount per litre of fuel. Never use more than recommended, because too much can actually cause problems in the combustion system.
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How do I use octane booster?
You use octane booster by pouring the correct amount into the fuel tank before or during refuelling. This allows the octane booster to mix well with the petrol and effectively raise the octane rating.
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Does an octane booster help with old petrol?
An octane booster only helps to a limited extent with old petrol. It can slightly raise the octane rating, but it does not restore aged or contaminated fuel, so replacing the fuel is often the best solution.
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