Size: 5.25 Fl Oz (Pack of 1)
I use these for my 1988 Mastercraft, with a 351w engine. I use with 91 octane, and the STP octane booster to help the engine run smooth, and cleaner.
Reviewed in the United States on July 6, 2024 by Matt Whiteley
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This will NOT increase hp, torque, or speed
Size: 5.25 Fl Oz (Pack of 1)
Do not buy this if you are thinking it will improve your vehicle's performance in some way. I made that mistake of ignorance myself when first grabbing a bottle off the gas station shelf. It likely won't hurt your engine to use one bottle per 15 gallons (they say up to 20), but it's just not what mos
t people think it is/does. **edit*- this DID cause transmission damage, knocks, and pings on my naturally aspirated system. I mistakenly thought that my variable octane (87-93) engine and drive train could handle this change in octane. This was my mistake, I was wrong, and this shouldn't be used on a naturally aspirated engine unless the gas has been sitting for ~6 months and has gone stale. Check with your dealer about your specific vehicle make & model.* Octane boosters raise the octane level of your fuel, making it MORE difficult for gasoline to combust under pressure. They get a bad rap as they're sold as performance enhancers, or speed boosters. High-revving, high psi turbo/supercharged engines can benefit from this as it leads to increased efficiency of combustion. High-octane fuel requiring performance cars that only have access to 87 octane gas stations, or fuel that's been sitting around a few months or more can benefit from this too. You can do some research yourself, but if your vehicle does not specifically recommend using an octane booster or a fuel with octane higher than 91 or 93, then it's likely not for you. Maybe if you only have access to low octane gas, but this is an expensive way to boost it by only a little. You're way better off using 93, or 91 octane as your car will take. Using with regular gas if your car takes regular 87 octane gas will do nothing. I use it in a naturally aspirated 3.8L V6 with 104k miles and it was what was causing me knocks around 3rd gear. Typically a fuel system cleaner (and this part is important!) which SPECIFICALLY lists the detergent levels, not just the name of the chemical the detergent used, is a better bet for increasing performance, but still only by a few hp in the best of scenarios on the oldest of cars in the worst of shape over a long time after a lot of uses, and typically is only around up to 0.5hp. This one doesn't even list the detergent I don't think, just that it has 'jet fuel' whatever tf that actually is. It's not fuel for a jet, that's for sure (kerosine is what jet fuel actually is). There are way way better options for boosting performance, and I'm not sure how this would handle in a system that can't take varying levels of octane. Snake oil for many, but it does have it's uses and works for some very specific cases and again, it does not make sense to me yet why. I have some unknown issue, in a 3-year-old car with a ton of miles for the years, which can take variable octane fuels. I likely have some hairline crack in my fuel system somewhere leaking vapor or letting moisture in. **edit*- it was this octane booster which was contributing to my tranmission knocking issue. After stopping use and going down in fuel grade for a month, it's running like new again.*
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Reviewed in the United States on December 26, 2022 by Snake Plissken
Size: 5.25 Fl Oz (Pack of 1)
I've only driven a few miles with it. It has definitely improved engine responsiveness. I have a long road trip coming up and hoping it will improve mileage such that it extends the distance btw gas station stops.
Reviewed in the United States on April 5, 2024 by A Buyer
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Makes a palpable difference in engine noise (SIGNIFICANTLY reduced), ping and overall torque
Size: 5.25 Fl Oz (Pack of 1)
Makes a palpable difference in engine noise (SIGNIFICANTLY reduced), ping and overall torque; no surpise there considering it's an STP product...pricepoint is amazing
Reviewed in the United States on July 9, 2024 by James Westwood
Size: 5.25 Fl Oz (Pack of 1)
Car ran better after I accidentally put regular gas in my car that needs premium
Reviewed in the United States on May 21, 2024 by Door2Door DME
Size: 5.25 Fl Oz (Pack of 1)
It makes my 2010 cadillac dts run a little smother and get a tad better gas mileage. I like having it delivered because I hate going to auto parts store. Came on time will buy again
Reviewed in the United States on June 27, 2024 by haley m.
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Hay que cuidar la inversión
Size: 5.25 Fl Oz (Pack of 1)
Estoy probando,me fui por esta marca ,por el buen historial que tiene
Reviewed in the United States on June 29, 2024 by phabriccio
Size: 5.25 Fl Oz (Pack of 1)
It seems like one of those items, but you don't know if it worked.
Reviewed in the United States on June 10, 2024 by Deaton
