STP Ultra 5 in 1 Petrol System Cleaner 400ml, Restores Power and Protects your Engine, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK

I tried the STP Ultra 5 in 1 Petrol System Cleaner and I am really impressed with the results. I added the 400ml bottle to a full tank as recommended, and after just a few drives I could feel the difference. The engine runs smoother, the idle feels more stable, and acceleration is noticeably more responsive. It also seems to have reduced a bit of hesitation when pulling away. Fuel economy has slightly improved as well – not a massive change, but enough to notice over a couple of tanks. What I like is that it’s a concentrated formula, so one bottle is enough for a full treatment. It gives peace of mind knowing it’s helping to clean injectors, reduce carbon deposits, and protect the fuel system at the same time. Easy to use, good instructions on the bottle, and made in the UK which is a bonus. For the price, I think it’s excellent value – cheaper than a garage clean and helps keep the car maintained between services.

Worked an absolute treat on my 30 year old Moto Guzzi. Cleared all the crap out and now the old girl runs sweet as a nut!

It’s always good to chuck a cleaner in with the fuel now and then Had no problems Good product

I have a 50cc Honda generator which had to be run with the choke halfway on, due to leaving fuel in the carburettor for 4 months. (I did use e5 and a fuel stabiliser yes). I put about a 20ml pour (used to be a Barman) in about a litre of fuel and ran the machine with a load. This immediately fixed the problem. So I can say this product definitely works!

Used this over several years in different cars and always found that after a few miles the engine does appear to run smoother and acceleration is more responsive. Its an additive which does as it says on the bottle and good value for money.

I use this now and again in my motorcycle but I honestly couldn’t say if it makes a difference, fingers crossed.

So I’ll start by saying that I really don’t know anything about cars. Like almost nothing. So this review is aimed at people that share that similar knowledge (seriously like if I had to scale it; 3 out of 100 in car mechanics knowledge). My car was misfiring every day. Cylinder 4. Apparently, BMW said I needed a new fuel injector. At around £750+ all in, I decided I’d just get a new car (this one was at 155000 miles and 9 years old after all). However, after a bit of googling, I found that a common issue was that the fuel injector’s lines can get clogged up and cause the symptoms my car was dealing with. So I thought I’d try and give it one last push with the BMW before ditching it. Researched the best options and this one came out as one of the best for the money. So I gave it a go. It was super easy to pour in, as the neck is really long and slots right into where you put your petrol in. Couldn’t be simpler. I left it overnight and then went to work. When I started it up, my car continued to misfire just as before (it only did it when I hadn’t driven it for about 8 hours. Once it had been driving a while, I could stop and start to my hearts content). I didn’t notice any difference whatsoever. Other than the fact the fuel gauge had gone up slightly (hadn’t considered that it would basically be adding more fuel, sort of, so bonus!). It wasn’t until the drive home (having done about 15-20 miles total since adding it) that I noticed all of a sudden that the car had become a little smoother to drive. I noticed the acceleration also seemed a lot better. It only stayed like this for a few days though, before getting worse. It continued misfiring on every morning start up and I got fed up with it, so I just sold it and moved on. So, did it work? I guess it did improve the performance slightly for a few days. Maybe it would have done better if my car wasn’t already falling apart, though. Ultimately, for the money, I’d say try it. You’ll sort of get its value in petrol (when topping up your tank) and if you’re just looking to improve the overall performance and health of your car; it probably does that.

Absolutely swear by this stuff. Some of these products have a bit of the 'snake oil' feel about them and I guess a lot is going to depend on the age of your vehicle but for my part it certainly increased the mpg and the car just seems to run much smoother after I've used one of these.

I had pinging in my Hemi V8 using 95 octane. I added this product and it cured the pinging, improved performance and throttle response. On a road trip to a neighboring country I can get 98 Octane fuel with no pinging problems evident and no need for octane booster. The conclusion was that the fuel available is poor quality. This product can compensate for poor quality fuel.

Good product, I used it and took my zen Estilo on a 1200 kms drive, found a mileage improvement of 3 kmpl. With just one bottle. It is recommended you use at least 2-3 bottles of using on an old car (8 yrs and 83K kms - in my case) to get good results. Expect an overall increment of around 5-6 kmpl on highway and around 3kmpl in city ride. It also gave extra knock of power to the old lady,,,,,,, the drive field very smooth and powerful while overtaking others . Would be buying again.

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Does wonders to your car performance and fuel consumption!