Chevron 67740-CASE Techron Concentrate Plus Fuel System Cleaner - 12 oz. (Pack of 6)

I genuinely live by this stuff. It’s a proven engine deposit cleaner that’s been around for a long time. After pouring a bottle into my tank and then filling it up at the local Chevron, the car now gets better gas mileage. I used to average 16mpg but now I average 19mpg. This product truly does allow you to “care for your car.” The engine also sounds better and seems more responsive to the gas pedal.

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.

I bought this after a friend advised me to use it and it really worked. I'm no expert mechanic but I was able to see the engine becoming less noisy and there was a still improvement in the mpg.Used it in a rogue and elantra, and it worked like a charm.I later suggested this product to another friend who had a relatively new Palisade and he too impressed and had similar experience as mine.I'm certainly going to use this regularly with the hope to maintain my cars better with fewer visits to a mechanic

This is great stuff, probably the best fuel system cleaner out there that is administered through the gas tank. I've been using it for about 20 years, ever since I learned about it from several very educational car repair programs on the radio, one of them being "Car Talk," and I've had great results ever since.Here's a little history on how Techron was originally created, right from one of those local Automotive Tech School radio programs a few years back:"It's not necessary to clean injectors - that's really not much of a problem any more, but it's more for keeping the intake track clean and the deposits off the intake valves. Techron is something that Chevron developed in conjunction with BMW some years back. They basically set the industry standards for intake valve cleanliness. BMW cars - they're very precision machines - they really had some drivability problems when intake deposits accumulated."It didn't take a whole lot of time, we're talking 15,000 to 20,000 miles and things were starting to happen there. Initially, BMW's fix for this was for you to take your car into the dealership's service department, and the technicians or mechanics would partially disassemble the top half of your engine to gain access to the intake valves or the ports, meaning that they had to remove the manifold and some other components to physically get access to the intake valves. And then they would use like a little sand-blasting piece of equipment, only the medium used was ground-up walnut shells, to physically clean those deposits off. This wasn't practical to have people come in every 15,000 - 25,000 miles to have the top half of their engine disassembled so they could shoot walnut shells at it. And the reason they used walnut shells was because it was an abrasive enough medium that it would get rid of the deposits but it was benign enough that if it got down in the engine it wasn't going to hurt anything - it would just burn up."So BMW got together with Chevron, which is obviously a major oil company, and said, "Hey, what can we do to come up with something we can put in the gasoline to keep this stuff cleaned out so that we don't have to do this?" Chevron did a lot of research and a lot of testing. BMW set standards for intake valve cleanliness on port fuel-injected cars, specifically theirs, but it's going to work on any engine, and Chevron came up with this Techron additive. I think Chevron puts it in most of their fuels, at least their hi-test. But unfortunately, we don't see too many Chevron stations in the state of Ohio. I think they're south and west...I know they're out West. But, short of that, you can buy it off the shelf in little bottles."As far as how often to use Techron, a newer car with very few miles on it, just use it a couple times a year. If you've got a car that's got some miles on it and its never been used in it before, maybe two or three consecutive tankfuls initially, and just follow the directions on the bottle."Note: Do not confuse "Techron" with "Pro-gard with Techron," which also comes in an identical black, long-necked plastic bottle. I believe "Techron" is the more powerful, less diluted product. Also, as Techron use can contaminate the oil slightly after use according to Techron's customer service, probably the best time to add it to your gas tank is one tankful before an oil change.

As other reviewers have stated, item arrived damaged and leaking. Foil seal under cap was open and contents was only held in with cap. I was lucky to receive a full bottle, despite small amounts inside of shipping box. Other items in box were luckily not too badly covered in this fuel additive. At least tape over the cap Amazon, so we don't have to deal with this and RETURN items. Suppose to be a great product according to the great and almighty Scotty !! Great price compared to smaller size bottles.

Certified ASE and factory trained Auto Tech 50 years. Have used and tested many brands in my life time. A lot of them work some don't. Found TECHRON does a very good job removing carbon from valves and piston heads. Also helps clean fuel injectors. Will use this brand as long as it's available