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expiredphoinix | Staff posted Dec 21, 2025 03:15 PM
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expiredphoinix | Staff posted Dec 21, 2025 03:15 PM

[S&S] $6.31*: 12-Oz STP Direct Injection Fuel Injector Cleaner at Amazon

$6.31

$14

54% off
Amazon
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Amazon [amazon.com] has 12-Oz STP Direct Injection Fuel Injector Cleaner for $6.64 - 5% when you check out via Subscribe & Save = $6.31.
Shipping is free with Prime or on $35+ orders.

Price
$7.57 lower (55% savings) than the typical price of $13.88

*Previous Frontpage Deal at $6.50 with 18 Deal Score and 12 comments.

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5%: $6.31
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Customer reviews
4.7⭐ / 2,014
600+ bought in past month

amazon.com/dp/B002FYIS7Q [amazon.com]

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Product Info
Community Notes
About the Poster
Amazon [amazon.com] has 12-Oz STP Direct Injection Fuel Injector Cleaner for $6.64 - 5% when you check out via Subscribe & Save = $6.31.
Shipping is free with Prime or on $35+ orders.

Price
$7.57 lower (55% savings) than the typical price of $13.88

*Previous Frontpage Deal at $6.50 with 18 Deal Score and 12 comments.

Subscribe & Save
5%: $6.31
Add to next delivery [amazon.com] (with free shipping)
fillers [amazon.com]

Customer reviews
4.7⭐ / 2,014
600+ bought in past month

amazon.com/dp/B002FYIS7Q [amazon.com]

My other deals

#pfpd

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Deal Score
+8
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Model: STP Direct Injection Fuel Injector Cleaner, Advanced Synthetic Technology Fuel Cleaner Dissolves Hardened Deposits that Accumulate on Injectors, 12 Oz, STP

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Dec 21, 2025 03:54 PM
69 Posts
Joined Nov 2015
TVguy1234Dec 21, 2025 03:54 PM
69 Posts
Any idea if this is worth it? Thanks, also assume I wait till engine close to empty and put it in the fill on top
1
Dec 21, 2025 04:07 PM
2,239 Posts
Joined Oct 2008
asukaDec 21, 2025 04:07 PM
2,239 Posts

Our community has rated this post as helpful. If you agree, why not thank asuka

Quote from TVguy1234 :
Any idea if this is worth it? Thanks, also assume I wait till engine close to empty and put it in the fill on top
If you have a clogged injector, sure. I usually dump one in about 1-2 tanks before an oil change. If anything gets kicked into the fuel that combusts, it'll get caught in the oil and filter about to be replaced, instead of sitting there for another few thousands miles. Can't hurt the car.
2
1
Dec 21, 2025 04:11 PM
69 Posts
Joined Nov 2015
TVguy1234Dec 21, 2025 04:11 PM
69 Posts
Quote from asuka :
If you have a clogged injector, sure. I usually dump one in about 1-2 tanks before an oil change. If anything gets kicked into the fuel that combusts, it'll get caught in the oil and filter about to be replaced, instead of sitting there for another few thousands miles. Can't hurt the car.
Thanks, follow up questions. Is doing this the same as this service from the dealer (EFI SERVICE (FUEL INJECTION CLEANING SERVICE)). I just got the oil changed and they offered this at service time, so do you recommend holding off?
Dec 21, 2025 05:35 PM
3,217 Posts
Joined Mar 2005
00dahcDec 21, 2025 05:35 PM
3,217 Posts
Quote from asuka :
If you have a clogged injector, sure. I usually dump one in about 1-2 tanks before an oil change. If anything gets kicked into the fuel that combusts, it'll get caught in the oil and filter about to be replaced, instead of sitting there for another few thousands miles. Can't hurt the car.
That's not how engines work at all.

No need to do this before an oil change
1
Dec 21, 2025 05:36 PM
3,217 Posts
Joined Mar 2005
00dahcDec 21, 2025 05:36 PM
3,217 Posts
Quote from TVguy1234 :
Any idea if this is worth it? Thanks, also assume I wait till engine close to empty and put it in the fill on top
Engines don't go empty, they don't work like that. Your car has a gas tank which your engine uses to fuel it. You put it into that.
1
2
Dec 21, 2025 11:49 PM
2,074 Posts
Joined May 2011
jugernotDec 21, 2025 11:49 PM
2,074 Posts
Quote from 00dahc :
Engines don't go empty, they don't work like that. Your car has a gas tank which your engine uses to fuel it. You put it into that.
He meant gas tank near empty...
1
Dec 22, 2025 12:35 AM
736 Posts
Joined Jul 2007
onlycashDec 22, 2025 12:35 AM
736 Posts
Quote from TVguy1234 :
Any idea if this is worth it? Thanks, also assume I wait till engine close to empty and put it in the fill on top

This is a very interesting video that answers many of the questions you should be asking before buying any fuel additive.


https://www.youtube.com/watch?v=MAAJCEatYsY




.

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Dec 22, 2025 12:44 AM
311 Posts
Joined Feb 2019
iinPhotoDec 22, 2025 12:44 AM
311 Posts
Just contains double PEA compares to premium gasoline which means pretty low concentration for fuel system failures. Pick Red Line sl-1 Techron Concentrated complete fuel system cleaner which contain much higher concentrated PEA to clean built up and clogs.
Dec 22, 2025 02:03 AM
2,239 Posts
Joined Oct 2008
asukaDec 22, 2025 02:03 AM
2,239 Posts
Quote from 00dahc :
That's not how engines work at all. No need to do this before an oil change
I never said need. Best not to infer things people didn't actually say to make an argument.

It is a good time to do it regularly, without following the ridiculous schedules some of these products advertise, and helps ensure the cleanest oil.

It is possible for contaminants stuck in the injector to break off into the engine. That's where stuff normally goes, because fuel, you know, goes into the engine.
Dec 22, 2025 04:24 AM
2,239 Posts
Joined Oct 2008
asukaDec 22, 2025 04:24 AM
2,239 Posts
Quote from TVguy1234 :
Thanks, follow up questions. Is doing this the same as this service from the dealer (EFI SERVICE (FUEL INJECTION CLEANING SERVICE)). I just got the oil changed and they offered this at service time, so do you recommend holding off?
It's hard to say, but I would say probably. I see no reason to do any FI cleaning at the dealer unless it is required service in the manual.
Dec 22, 2025 10:11 AM
2,239 Posts
Joined Oct 2008
asukaDec 22, 2025 10:11 AM
2,239 Posts
Deal is showing as expired, but just checked and it's still live for me.
Dec 22, 2025 10:46 PM
3,217 Posts
Joined Mar 2005
00dahcDec 22, 2025 10:46 PM
3,217 Posts
Quote from asuka :
I never said need. Best not to infer things people didn't actually say to make an argument. It is a good time to do it regularly, without following the ridiculous schedules some of these products advertise, and helps ensure the cleanest oil. It is possible for contaminants stuck in the injector to break off into the engine. That's where stuff normally goes, because fuel, you know, goes into the engine.
So you think that things in the combustion chamber means it's going into the oil. You should have just started with that, now I know for certain you have no idea what you're talking about
1
Dec 22, 2025 11:32 PM
2,239 Posts
Joined Oct 2008
asukaDec 22, 2025 11:32 PM
2,239 Posts
Quote from 00dahc :
So you think that things in the combustion chamber means it's going into the oil. You should have just started with that, now I know for certain you have no idea what you're talking about
Another weasel word twisting with "means" so, yeah... I'm done talkkng to you.

To others, I continue the disagreement in case there are more replies.

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