Techron Concentrate Plus Fuel System Cleaner, 20 oz., Pack of 1

This Techron additive is the best PEA (Poly Ether Amine) product out there in terms of the amount of PEA per oz you are getting. As a result, it works well in my experience on two different problems, within limits. a. It is VERY good at reducing or eliminating engine knock. However, you have to use it a while (longer than the marketing blurb of one bottle). In my experience, to rid yourself of engine knock, use TWO bottles on one tank of gas on a car, e.g. 20 gallon tank. (4 bottles on one tank of gas on a truck, e.g. 30 gallon tank) That is for the first use. Then after going through that tank in natural driving, then use 1 more bottle per tank for two more tanks. (On a truck, that 6 bottles). On a car, that is 4 bottles. More than they say you need, but that is my experience. b. It is OK at remedying Catalytic converter problems. (e.g. P0420 code signifies "Catalyst System Efficiency Below Threshold (Bank 1), or the similar P0421 (for Bank2). These codes fire when your catalytic converter is not working. Whether Techron can help fix that or not depends on your vehicle's situation, and how long its been having an issue. The short version, if its been a long time (months and months, or years), this product is unlikely to solve your problems. That is because not only did the vehicle throw the catalytic convert code, but you ignored it a long time. Which typically means that you Catalytic converter has been getting over-temped for a long time, and you have likely melted a good chunk of the internal honeycomb structure as a result. No magic gas tank chemical is going to fix that. But if your vehicle "just' threw the code, this stuff might work. A LOT of the time on older cars, the issue(s) are that you have older rings on your cylinders and they are leaking more oil to the PCV system, and then back into the air intake. That is really dirty oily air, being "reburned" at the demand of Air Quality standards people, to keep the atomosphere cleaner. But its putting tons of oily dirty air through your cylinders and then catalytic converter. That oil doesn't all burn in the cylinder, and so it flows to the Catalytic converter, where it does 1 of two things. It either burns, and coats your platinum coated honeycomb with carbon deposits, or it is not all burned, and it coats it with carbon deposits and "wet oil" residue. This Techron seems to be very good at cleaning up both of those issues. I have old cars, and both (now) use oil catch cans, installed between the PCV valve on the engine, and the air intake's auxillary "SMOG" recycle input orifice. (There is a rubber or metal tube line that runs from the PCV valve to the air intake. An oil catch can is a great idea to catch and cleanup a lot of this oil in that air before it makes it to your engine. This Techron is the other end of the problem. In the gas, it helps clean up the carbon and oil residue in the Catalytic converter (and on your cylinder heads and piston tops), getting rid of knocks (the later), and Cat codes (the former). But as I said. If your Catalytic converter is too far gone, nothing will help it. But spending $100 on 4-6 bottles of this Techron is often worth the effort to "heal" your Cat enough to pass a test. Long term, an oil catch can, and different driving patterns, and checking your spark plugs and ignition coils is worth while. Mis-gaped spark plugs (they wear over time) and aging and imperfect coils can also cause the same problems. Unburned gasoline (instead of oil) that clogs up the Cat. I have fixed my Cat twice now with this stuff. (Each brought on by long drives, over mountain pass freeways (4500 ft., and 4000 ft. (from sea level) charging up the mountain at sustained engine loading. That tends to make old engines just "crap" oil into the air intake (via rings, PVC, intake-second burn) and clog up your Cat. Put some of this stuff in right away, and it can often be reverse without the Cat having gotten SO hot, that it melted the honeycomb, or SO clogged (if not melted), that no chemical is going to succeed to getting the blockage cleaned out. All PEA is good, and this has the most.

Works good at cleaning direct injection fuel systems and price is better than what stores charge.

PRO - The very BEST fuel injector cleaner on the market, made by CHEVRON the world’s top energy firm. Mechanics have depended on this for years. This works two ways; it will solve injector problems and (with regular use, 2x per year) it will also prevent fuel system problems. CON - Follow instructions on the bottle exactly, or you’ll waste money and need to repeat treatments. In recent years, Techron has gotten expensive.

If you can’t find Top Tier gasoline, this is a great alternative to keep your valves and injectors clean and prevent carbon build up in your cylinders. Works well, especially for newer motors that have direct fuel injection into the cylinders instead of the intake.

Seems to work as advertised, used in a 2020 Cargo Van that showed more miles to the gallon after treatment than it did prior. Maybe it's just with the first treatment but doesn't seem to help with any pickup power. I've seen this advertised as being used every 10k miles, but on the bottle it shows usage as every 3k miles so little disappointed on that.

I’ve used Chevron Techron Concentrate Plus a few times now, and it consistently delivers. After adding it to a full tank, I noticed smoother acceleration and a quieter idle within the first drive cycle. This cleaner is simple to use and gives peace of mind knowing it helps clean fuel injectors, intake valves, and the overall fuel system. It’s especially useful if you don’t always run premium fuel or if the vehicle has higher mileage. I like using it as part of regular maintenance every few thousand miles. For the price, it’s an easy add-on that actually feels like it makes a difference. If you want a trusted fuel system cleaner from a reputable brand, this one is hard to beat.

Really great product. I’ve been using Techron for years. Can’t beat the price and it came on time and in good condition with no leakage

Very happy with what this product and definitely increasing the gas mileage at a nominal fee!! I can only hope it truly works with cleaning injectors as it says!!