What is Petrol System Cleaner?

Redex Petrol System Cleaner is a fuel additive specially developed to reduce emissions and restore performance in your fuel system. It is compatible with E10 fuel, and our new updated formula also protects against corrosion from E10 fuel, so it can be used safely in all petrol cars.

  • Protects against corrosion from E10 fuel
  • Cleans fuel system
  • Reduces emissions
  • Restores performance
  • Suitable for all petrol engines including hybrid.

Redex Petrol fuel additives can be used safely with new E10 fuel in E10 compatible cars, as well as with E5.

How Much Should I Use?

Each Redex bottle clearly shows how many fuel additive doses it contains on the front label, with easy marking on the side. 1 dose or “shot” is required for the average sized tank at 50Litres.

The precise dosage is 2.5ml of Redex System Cleaner per litre of fuel.

If your tank is larger or smaller, you can still use the recommended dosage with the same level of performance being achieved.


During combustion, deposits build up on your fuel injectors and lead to an inefficient use of petrol. Redex stops this build up and cleans the injectors to save you petrol, and as the UK’s number one fuel additive we’ve been trusted by drivers for decades.

A regular shot of Redex, specially formulated for petrol engines, can save fuel and help you to pass your MOT by reducing your emissions.

Using Redex is a simple part of a car maintenance routine which can keep your injectors working better and extend the life of your car. It’s driving’s best kept secret – pour a shot of Redex Petrol System Cleaner into the tank regularly to keep your car driving further.

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Frequently Asked Questions


Redex is available in a range of bottle sizes and each is designed to deliver the correct amount to treat 50 litres or one tank of fuel. The Redex "one shot" bottles contain 125ml, which is one "dose" of Redex for a full tank.

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Over time harmful deposits will build up on your fuel injectors and this will impair the function. When the injectors are clean the fuel sprays in clean jets, but the build up impairs this so the fuel isn't used as efficiently.

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Redex is sold in stores across the UK including national supermarkets and local specialist retailers. You can find out more on our Where to Buy page.

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