As I’ve made clear previously, this isn’t a laboratory test in controlled conditions but rather a real-world trial that gives a decent indication of what any driver can expect in everyday life. Firstly, if you have an older or higher-mileage car, you are far more likely to see noticeable improvements in performance and fuel economy compared to a newer, lower-mileage vehicle. Given that fuel deposits and debris build up in your engine over time, it makes sense that you’ll notice a greater improvement in an older engine that has seen a few million more fuel explosions than a newer engine. If I’d been running the same test on an older car I am sure I would have seen some more noticeable results, but unfortunately I don’t have an older car to call upon for such a purpose (and buying an old banger to drive for three months didn’t really appeal!) My fuel economy figures haven’t shown any changes that could really be attributed to the Redex products. The variation of 3-4mpg above or below the average based on driving conditions and traffic outweighs any potential gain from the products. Again, if you were running a laboratory experiment that directly measured fuel consumption and removed all other variables then you may be able to show an improvement, but it’s nothing really noticeable. Each Redex bottle clearly shows how many fuel additive doses it contains on the front label, with easy marking on the side. 1 dose, is determined around the average size tank size at 50Litres. 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.

As with Cataclean, we often get a lot of questions in our chat box regarding Redex and how best to use it. So we thought we’d write a short article covering the most common questions as well as providing the instructions from the manufacturer. Redex instructionsIt still seemed to choke a bit more at first, but started to perform a bit better a few days later. Read less It has markings on its side so you know how much to put in, but it's hard to judge once the bottle is upside down. The initial baseline figure of 30mpg is pretty indicative of my usual fuel economy result, although usually that’s relying on the car’s trip computer reading rather than direct measurement. OVERALL: Good product. Performance and emissions difference is noticeable, but don't expect the world. Generally, makes the motor run smoother. Since May, I’ve been recording my fuel economy every time I fill up the tank – manually noting down the litres added and mileage covered, rather than relying on the car’s trip computer – and adding a dose of Redex to the tank.

After the initial 500mL dose of Redex Advanced 5-in-1 system cleaner, I have been adding a small 90mL bottle of Redex petrol system cleaner every time I have filled up my fuel tank for three months. In my situation, I don’t think I really need to keep using the additives at that rate in my car. I am likely to add a 90mL bottle every month or so and probably use the concentrated cleaner every six months to keep the Mazda’s fuel system sparkling clean. If I had an older car (or when this one starts getting older and higher-mileage), I’d keep using it every tank or at least every other tank. I mentioned in my last report that I’d previously noticed a slight cough or misfire from the Mazda on a couple of occasionsprior to using the Redex products, but hadn’t noticed anything since using the fuel system cleaners. I can report that the engine has still been running cleanly over the last six weeks, so the stuff appears to be doing its job in that respect. Summary The principle with the fuel system cleaner additives is that a clean fuel system will perform more efficiently than a clogged fuel system, much like your heart being able to pump blood more freely through clear arteries than clogged ones. Clogged arteries also mean your heart has to work harder and is at greater risk of heart damage, and your engine is no different. Over time, clogged fuel injectors can potentially lead to expensive engine damage.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. 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. Pour in one dose of Redex – The size of Redex bottle you have will determine the amount to pour in. A single dose will treat a 50 litre tank