I bought a bottle a few years back. It tasted like STP. Would not recommend.
Cons: tasted like STP
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I recently used STP 5 in 1 on my 80k 2011 diesel engine. I have noticed no benefits from using it after adding it to a full tank and emptying it.
Cons: no benefits noticed
Mileage: 128747 km
STP concentrated formula has worked out for me increasing mileage slightly on some old cars I've got running again
Pros: increasing mileage slightly
Vehicle:
Hyundai Veloster
I like using the STP All-In-One if I can find it. Very nice and reliable imo
Pros: nice and reliable
I have no idea why I do it, but I throw a $4 botle of STP in my gas 1 or 2 times a year in probably all my cars. I feel like it can't hurt. I hope that maybe, just maybe, it improves my fuel injectors somehow which keeps up the good fuel economy and good power.
Pros: may improve fuel injectors
Cons: no idea why
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What we know about STP fuel additives
The brand is registered in UK. Official website: http://stp.one/.
In March 2026, PartReview does not yet have a formed opinion of STP fuel additives. You can help by adding a review for STP fuel additives.
Currently there are 5 reviews and 16 votes. Average rating — 2.8 out of 5. Vote balance: 8 up, 8 down.
Users also evaluated the qualities of STP fuel additives:
- Starting - easier cold starts after treatment are noticeable - rated positively. 4 points out of 5.
- Hesitation - less stumble on acceleration improves drivability - rated positively. 3.6 points out of 5.
- Exhaust smell - fuel odor or smoke may lessen after use - no rating yet
Fuel additives STP in car-specific ratings
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