Our petrol and diesel fuel system cleaners are supplied in 250ml and 500ml sizes. The smaller 250ml version contains two doses / shots and the 500ml provides 4 shots.

One shot of Redex fuel cleaner is capable of treating a fifty-litre fuel tank, but those who have never used a fuel additive before – or those who own an older car – may wish to use two shots for an intensive clean, particularly during first application.

Also, if your tank is larger or smaller than 50 litres you can still use the recommended dosage with same level of performance being achieved.

Each Redex bottle clearly shows how many shots it contains on the front label, with easy guide ‘shot’ marking on the side. Adding more than one shot of Redex won’t do any harm to your car and can give you a more intensive clean, so don’t worry if your pouring isn’t exact.

Please note though, Redex has been safe-tested at 4 times the recommended dose, so please don’t exceed this.

What is the Mix Ratio for Redex?

Our Redex experts or ‘RedExperts’ were recently asked “what is the mix ratio for Redex?” – the mix ratio for Redex is 1 shot per 50 litres of fuel, which equates to 2.5ml per litre of fuel. Take a look at our video.

You can find more answers to common Redex questions by checking out our Ask the RedExpert videos.

Our products are tested rigorously in real life situations, and ensure no harmful side effects. Redex mixes with your fuel, so simply add it to your tank when you top up to help you improve your MPG and save money.

You can view more information about Redex on our blog and product pages, including how to use Redex, how to keep your car in good condition and how our full range can help you.

If you would like to get in touch with us to ask us a question, you can find our details on the contact us page.