Ultra 5 in 1 Fuel System Cleaner by STP (R), Fuel Additive for At-Home Fuel Treatment for Vehicles, 12 OZ

Ethanol sucks and this product doesn’t make a dent in the Midwest. But, when outside the Ethanol zone my Jeep Wrangler gets better mpg than what it’s suppose to. In California got 23 mpg plus highway, and similar on the east coast. With electric cars I’ve read that it’ll dwindle corn fuel to a lost industry. Let’s hope so. Not worried about my Jeep as gas cars will still be present. Just a mix of hybrid and electric. It’s just for fun. And is. I don’t drive much. Use the motorcycle. Buy the best gas. But sometimes the only choose is corn fuel. Mostly do highway travel with the Jeep. I’m not in it for high mpg. But at least 20 plus highway when I use Ecco and cruise. When I hit 23 plus couldn’t believe it. At the moment driving to the VA on the highway at at 17.8. WTF? I’ve got this product on sub and save so happy it’s in stock and arriving next week /\ update 2nd purchase. Does a great job on road trips boosting miles per gallon and keeping the engine running smooth. Will repurchase ⭐️⭐️⭐️⭐️⭐️💯 Update /\ First time in a year since COVID I’m driving more than twenty miles a month on average with the Wrangler. Headed to Nashville area to visit family. Didn’t wanna go to the auto store so popped online to order and have some delivered. I used half for the first tank of gas and the rest during the first fill on the 1200 round trip. It’s for up to 35 gallons is why I divided it. Went from about 16 mpg back to normal 19 to 20 highway. I have used products similar to this for decades to help the engine for all reasons described. Typically don’t spend quite as much on fuel treatment, but with gas prices at their current level and the fact the Jeep sat a lot for a couple of years except for local driving dipping through normal mpg of 20. Figured a an intense product would be more helpful then regular gas treatment. Plus, gonna start riding the motorcycle again. Took a break during COVID. Wanna keep the Jeep in top engine function shape. In case you’re wondering, 2016 Wrangler. Based on my experience with a variety of products am happy with the results of this product. The engine runs great and the mpg is returned to normal after about 300 miles. This is less then two tanks of gas from about 16 back to 20 mpg. And, remained at this level all the way back. At the current gas prices am very happy with the improved mpg so quickly. Another reason I use gas treatment on trips is in case bad gas is sold. I stick with recognizable companies over cheap gas from an unknown. The app Gas Buddy was super helpful, too. Loves App Rocks ⭐️⭐️⭐️⭐️⭐️💯

I have two vehicles with over 200k miles (01 jeep xj & 2008 subaru outback) and this stuff keeps them running good. It’s so cheap.. if you go get an oil change, they’ll charge $85+ for this service. It takes less than 60seconds to do it yourself! I keep a few bottles around and recommend it all the time. it also cleared my engine code on both of my vehicles 🤷🏽‍♂️

This system cleaner really made a change to my car. It’s recommended to not use to often but it’s worth the money because it really cleans your cars system. Easy to use as you just pour on a near empty gas tank. My mpg got raised up again ever since I poured this cleaner into my car. Highly recommend to save on gas!

Good dependable product for engine cleaning

The very first product I bought from STP was just the fuel injector cleaner. I had never used a fuel additive in my life so I decided to gave it a try and it worked. However, I wanted more which had led me to this product. I was thrilled as I read the descriptions. I was planning on using this STP ultra after my next oil change. Some time early last week as I was driving home, the check engine light came on. It was a code showing P0399. I looked it up and it said something about the crank position sensor having issues. My check engine light been on for days now. There was also another code P0420. I knew my catalytic converter was dirty so I went to autozone to buy CataClean. When it was Friday I finally got an oil change. The direction of this bottle says to use when the gas tank is half full. My gas tank been full. It was not until today I decided to pour this stuff into the gas tank some time during the afternoon. It didn't occur to me until later tonight I noticed the check engine light suddenly disappeared from the dash. I was like wow this is amazing! I was certain that there were all kinds of nasty build up in my car that had probably caused those error codes to pop up. Driving was pretty much smooth. I'm not so sure about the MPG but I was amazed that it even turned off the engine light. I could not contain my excitement. Now I am just wondering how long will it stays off. I wanted to use this product at least once a week but it did say not until every 4,000 miles. I usually do an oil change every 5k. Anyway, I'll be purchasing this again. I also bought one for my dad's car since he been complaining about his car using a lot of gas during short trips. Update (9/10/18): The car's been running smooth and the check engine light still haven't came back! I highly recommend this product.

Pretty good .

I have a 2006 Dodge Ram 1500 that I don’t drive much. At 17 years old, I only now hit 40K miles. It’s had some evap system issues in the past that was repaired. In December, I drove the truck for a few hours to run errands for Christmas. On the way home, I stopped at a gas station I’ve used before to get gas (they use detergent gas). When I pulled away from the pump, the truck died. It kept dying all the way home (3 miles away) which made for a very scary ride. No lights came on indicating there was an issue like in the past. I first thought it was the battery needing to be changed because this is what happened once before when that was the issue, but a ‘check engine’ light came on at that time. Battery was fine. For 6 months, the truck mostly sat. When we did try to drive it, it kept dying and again, no check engine light. My brother thought maybe there was moisture in the tank and advised I get something for that. I came to Amazon but had a hard time finding the product he recommended. Instead I found this STP 5 in 1 Fuel System Cleaner. I bought a bottle of it and put it in my full tank of gas. After letting the truck idle for a bit, we decided to test drive it. It didn’t die not even once. We have been driving it for over a month now, whether it be a short trip or a longer trip, and I’m not having any issues. I should have already needed to fill my gas tank back up but I still have half a tank. The truck is quickly approaching 41K miles. I’ve bought 2 more bottles of the STP 5 in 1 and 2 bottles of the STP Fuel Injector Cleaner just in case I need it the next time I fill up. I don’t know what exactly the STP did to my truck (I suspect it cleared ethanol build up but can’t confirm) but thankfully for the time being, it has saved me a trip to the mechanic.

I didn't see much improve, but it seems to work according to other buyers.

Immediately felt the results on my cars

good product

Doesnt feel any improvement in drive. Also ensure you have funnel to fill in the tank. For my truck I didnt get any improvement.