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frontpagephoinix | Staff posted Apr 23, 2026 07:21 PM
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Item 1 of 2
frontpagephoinix | Staff posted Apr 23, 2026 07:21 PM

5-Oz LIQUI MOLY Valve Clean

$8.00

$15

46% off
Amazon
20 Comments 9,789 Views
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Amazon has 5-Oz LIQUI MOLY Valve Clean for $8. Shipping is free with Prime or on $35+ orders.Thanks to Deal Hunter phoinix for finding this deal.

About this item:
  • Better engine performance.Fit Type: Universal
  • Lower fuel consumption
  • Lower pollutant emissions
  • Protection against corrosion and carburetor icing

Editor's Notes

Written by Neo45 | Staff

Original Post

Written by phoinix | Staff
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Amazon has 5-Oz LIQUI MOLY Valve Clean for $8. Shipping is free with Prime or on $35+ orders.Thanks to Deal Hunter phoinix for finding this deal.

About this item:
  • Better engine performance.Fit Type: Universal
  • Lower fuel consumption
  • Lower pollutant emissions
  • Protection against corrosion and carburetor icing

Editor's Notes

Written by Neo45 | Staff

Original Post

Written by phoinix | Staff

Community Voting

Deal Score
+33
Good Deal
Get Deal at Amazon

Price Intelligence

Model: LIQUI MOLY Valve Clean | 150 ml | Petroladititive | SKU: 2001, Blue

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Top Comments

leeterbike
1751 Posts
447 Reputation
Yes. Most modern direct injection engines will not clean with this as the fuel never touches the intake valves. Engines with port injection will have fuel cleaning them and not need cleaned unless you have some serious problems.
texag09
508 Posts
102 Reputation
Yes and no. If you're trying to use it to clean dirty intake valves on a direct injection engine, then yes, total waste.

If it is an older vehicle with port injection, AND you're using poor quality fuel that doesn't have much detergent in it, then it might be useful. But if you use top tier fuel on a regular basis, probably not doing to do much.

And, even with direct injection, if you use non-top tier fuel, running this once every few thousand miles will help keep injectors slightly cleaner. Enough to fix a dirty injector, or fix a problem if one is already there? Probably not, but maybe enough to keep it from getting very dirty.
ElatedPear129
165 Posts
44 Reputation
One needs to understand a little bit about valve cleaning to see why this product is next to useless. Your typical valve with years of carbon deposits will have to be SOAKED in cleaning solution for hours for the deposit to start dissolving. Another approach, which works 100%, the valve needs to be blasted with a soft abrasive product like crushed walnut shells. If anyone believes that 150ml of anything dissolved in 56,781ml of gas (15 gallons) will do anything to your valves - good luck.

20 Comments

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Apr 25, 2026 12:33 AM
245 Posts
Joined Dec 2007
room209Apr 25, 2026 12:33 AM
245 Posts
slick price
Apr 25, 2026 01:19 PM
1,057 Posts
Joined Nov 2011
topshelf207Apr 25, 2026 01:19 PM
1,057 Posts
Aren't all these products(you add to the gas tank) a waste of money and don't actually do anything?
1
Apr 25, 2026 01:38 PM
1,751 Posts
Joined Sep 2014
leeterbikeApr 25, 2026 01:38 PM
1,751 Posts
Quote from topshelf207 :
Aren't all these products(you add to the gas tank) a waste of money and don't actually do anything?
Yes. Most modern direct injection engines will not clean with this as the fuel never touches the intake valves. Engines with port injection will have fuel cleaning them and not need cleaned unless you have some serious problems.
1
Apr 25, 2026 01:45 PM
165 Posts
Joined May 2023
ElatedPear129Apr 25, 2026 01:45 PM
165 Posts

Our community has rated this post as helpful. If you agree, why not thank ElatedPear129

One needs to understand a little bit about valve cleaning to see why this product is next to useless. Your typical valve with years of carbon deposits will have to be SOAKED in cleaning solution for hours for the deposit to start dissolving. Another approach, which works 100%, the valve needs to be blasted with a soft abrasive product like crushed walnut shells. If anyone believes that 150ml of anything dissolved in 56,781ml of gas (15 gallons) will do anything to your valves - good luck.
Last edited by ElatedPear129 April 25, 2026 at 06:47 AM.
1
Apr 25, 2026 02:06 PM
333 Posts
Joined Dec 2005
yesyoucantApr 25, 2026 02:06 PM
333 Posts
Great deal for smaller engines (lawn mower, etc)
Apr 25, 2026 02:51 PM
1,873 Posts
Joined Nov 2013
killerloopApr 25, 2026 02:51 PM
1,873 Posts
Quote from ElatedPear129 :
One needs to understand a little bit about valve cleaning to see why this product is next to useless. Your typical valve with years of carbon deposits will have to be SOAKED in cleaning solution for hours for the deposit to start dissolving. Another approach, which works 100%, the valve needs to be blasted with a soft abrasive product like crushed walnut shells. If anyone believes that 150ml of anything dissolved in 56,781ml of gas (15 gallons) will do anything to your valves - good luck.
Valvoline Restore & Protect, 3 change cycles min IYKYK
1
1
Apr 25, 2026 03:46 PM
508 Posts
Joined Aug 2013
texag09Apr 25, 2026 03:46 PM
508 Posts
Quote from topshelf207 :
Aren't all these products(you add to the gas tank) a waste of money and don't actually do anything?
Yes and no. If you're trying to use it to clean dirty intake valves on a direct injection engine, then yes, total waste.

If it is an older vehicle with port injection, AND you're using poor quality fuel that doesn't have much detergent in it, then it might be useful. But if you use top tier fuel on a regular basis, probably not doing to do much.

And, even with direct injection, if you use non-top tier fuel, running this once every few thousand miles will help keep injectors slightly cleaner. Enough to fix a dirty injector, or fix a problem if one is already there? Probably not, but maybe enough to keep it from getting very dirty.

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Apr 25, 2026 03:48 PM
508 Posts
Joined Aug 2013
texag09Apr 25, 2026 03:48 PM
508 Posts
Quote from killerloop :
Valvoline Restore & Protect, 3 change cycles min IYKYK
Valvoline R&P won't clean intake valves. It might reduce buildup due to cleaning piston rings, decreasing blow by, and a few other things. But as far as I know, won't do anything for intake valve buildup.
Apr 25, 2026 04:20 PM
29 Posts
Joined Nov 2017
nutrientApr 25, 2026 04:20 PM
29 Posts
Just a reminder that there's a Direct Injection version of this too. I've seen people use the wrong one.
2
Apr 25, 2026 04:21 PM
1,225 Posts
Joined Nov 2017
spittlbmApr 25, 2026 04:21 PM
1,225 Posts
Holy moly it's liqui moly!
1
Pro
Apr 25, 2026 06:14 PM
8,831 Posts
Joined Aug 2009
AznCracker
Pro
Apr 25, 2026 06:14 PM
8,831 Posts
Err if i throw a bottle of chevron in every 6 months, this won't do anything extra right?
Apr 25, 2026 10:40 PM
787 Posts
Joined Apr 2006
BorkApr 25, 2026 10:40 PM
787 Posts
Quote from ElatedPear129 :
One needs to understand a little bit about valve cleaning to see why this product is next to useless. Your typical valve with years of carbon deposits will have to be SOAKED in cleaning solution for hours for the deposit to start dissolving. Another approach, which works 100%, the valve needs to be blasted with a soft abrasive product like crushed walnut shells. If anyone believes that 150ml of anything dissolved in 56,781ml of gas (15 gallons) will do anything to your valves - good luck.
But if you have a new car that has port injection and don't normally use top tier fuel then using a product to keep valves clean has merit. Unfortunately this is probably not the product you want as it doesn't contain the same chemical as chevron Techron to work best.
Apr 26, 2026 04:03 AM
2,483 Posts
Joined Oct 2008
asukaApr 26, 2026 04:03 AM
2,483 Posts
Quote from texag09 :
Yes and no. If you're trying to use it to clean dirty intake valves on a direct injection engine, then yes, total waste.If it is an older vehicle with port injection, AND you're using poor quality fuel that doesn't have much detergent in it, then it might be useful. But if you use top tier fuel on a regular basis, probably not doing to do much. And, even with direct injection, if you use non-top tier fuel, running this once every few thousand miles will help keep injectors slightly cleaner. Enough to fix a dirty injector, or fix a problem if one is already there? Probably not, but maybe enough to keep it from getting very dirty.
All of this. I run a bottle of whatever's cheap on the last tank before an oil change. Run through that tank, then change the oil and filter.

While there's debate about the merit of that order (which I think there is at least some) it also makes sure you do it regularly alongside the oil change interval.
Last edited by asuka April 26, 2026 at 04:26 AM.
Apr 26, 2026 06:05 AM
57 Posts
Joined Dec 2023
MotherboardJaredApr 26, 2026 06:05 AM
57 Posts
Quote from leeterbike :
Yes. Most modern direct injection engines will not clean with this as the fuel never touches the intake valves. Engines with port injection will have fuel cleaning them and not need cleaned unless you have some serious problems.
Not to mention if you use top tier gas with a port injection car, they'll be plenty clean and free of buildup.

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Apr 26, 2026 06:07 AM
57 Posts
Joined Dec 2023
MotherboardJaredApr 26, 2026 06:07 AM
57 Posts
Quote from AznCracker :
Err if i throw a bottle of chevron in every 6 months, this won't do anything extra right?
Correct. Just do the Chevron complete fuel system cleaner every 6 months and that's plenty. Also make sure to use Top Tier rated gas.

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