STP Diesel High Milage Injector Cleaner 200 ml, Cleans and Protects your Engine for 300 miles, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK

I'm usually dubious about these type of products as they seem to be a hit or a miss. My van was a little grumpy on startup and noisy to drive but after using this it seems to have restored a little bit of power and the engine is running smoother and quieter than before. It obviously helped clean up some gunk and residue in the injectors.

I tried most famous ones and other new popular ones. None of them responded like this one. After i poured it into half tank, it worked in a few minutes. Acceleration is much better now.

STO products are very good and do the job depending on how old your vehicle is and how clogged your injectors are. Over 100,000 miles on my car and so far one injector replaced. This product does smooth out the idling and improves performance if used regularly as advised by the manufacturer.

5*

Car running mutch smoothly no more hesitation when you need the power.

Within 10 miles i suddenly started feeling the car was driving smoother, it was amazing how in cold morning starts it started immediately when i turn the key, no jerkiness due to it being cold.Then i went on a 100-mile trip the day after I put it in the tank, and my MPG exploded, i even had a game with the kids to see if i could get it higher, while keeping up with traffic, and reached 54 MPG at one point but, that was with a bit of neutral on long hills, not much mind you, there was a lot of stop starting as well.After a few days of normal driving I now am running at 48mpg, it is something i have never experienced in my car since I bought it 7 years ago, it has constantly been running at around 28mpg , 2007 ,model ford galaxy 2.0tdci. For those that use km a liter that is around 18km per literI think if this lasts a while, i am going to put in a bottle every third tank of fuel.

I've been using this in my car for 9 months now and cannot say I notice any difference. It might run slightly smoother but no difference in MPG or build up of carbon in the EGR valve. Still struggled to pass the emissions test too. So disappointed with the results od a long term test.

I wasn't convinced this small and magic bottle was going to do anything.. Not remotely.Mostly convinced of the opposite.. But facing £1.5k for some fuel injectors sharpened the focus on this hail Mary.The engine ran rough on idle, and was sluggish/stodgy when setting off from a start, the engine always felt slightly starved of something, especially noticable with a DSG/Automatic that short shifts. The engine felt slightly down on power, much as it does when an injector is about to go.The rough idling is pretty much gone, and the car feels a lot less stodgy and apathetic, also seems to be less down on power.I suspect it'd make little to no difference on an engine running well, but it's made a big difference to my old one! (85k miles)