This is used for Marine Engines ie Mercury brand, in which they don't have o2 sensors. If your using it in a car, your wasting a ton of money vs STP or something and i will ruin o2 sensor on a car

Is this how they call quickleen lubricant

Hi too the best of my knowledge it is fuel system cleaner nothing more however it may have some lubricating qualities. I do know that it works well if you use it on a regular basis.I use quickleen 1 with every fill up along with stabil for marine use it helps keep the moisture out of the fuel system.

will this cleaner free up compression relies valves?

I use this more on the preventative side and not fixing carbon build up or other material build up. I do understand you can use a higher dose of this additive and run the engine at lower rpms to help eliminate some of the build up. All depends on how dirty your valves have gotten. I have been using this additive for the past three years or almost 1800 hours on my engine. I have never had any issues with build up.

Does it also act as a gass stabilizer for winter storage?

It is a fuel system and injector cleaner. I used Marine Stabilizer in my fuel tank for winter storage.

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8M0047931 Quickleen Engine & Fuel System Cleaner, 12 oz

Product ID: 5311765

Details

Brand
MERCURY
Number of Items
1
Number of Packs
1
Thread Size
RM
Vehicle Service Type
Watercraft

⛽1 oz treats 5 gallons fuel

🔥Removes stubborn carbon deposits

🛠️Prevents engine knocking & seize-up

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Description

⛽ Keep your engine running cleaner, longer — don’t let carbon slow you down!

ENGINE GUARDIAN - Stops knocking and piston seize-up to extend engine life and performance
FUEL SMART FORMULA - Just 1 oz revitalizes 5 gallons of gasoline—maximize every drop
OEM TRUSTED QUALITY - Crafted by Mercury Marine to meet strict original equipment standards
CARBON CRUSHING POWER - Eradicates deposits from injectors, valves & spark plugs for peak engine efficiency
SEASON LONG CONFIDENCE - Use throughout the season for consistent, reliable engine care

Mercury Quickleen Engine & Fuel System Cleaner (12 oz) is a high-performance additive designed to remove carbon deposits from critical engine parts, prevent knocking and piston seize-up, and extend spark plug life. Safe for all 2-stroke and 4-stroke gasoline engines, it treats 5 gallons of fuel per ounce and is manufactured to Mercury Marine’s stringent OEM specifications, ensuring trusted quality and season-long engine protection.

Specifications

ASIN	B003ZF1GJQ
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#17,093 in Automotive ( See Top 100 in Automotive ) #39 in Fuel System Cleaners
Brand Name	MERCURY
Compatible with Vehicle Type	Watercraft
Customer Reviews	4.8 4.8 out of 5 stars (834)
Included Components	1 Bottle
Manufacturer	Mercury Marine Mercruiser
Manufacturer Part Number	8M0047931
Manufacturer Warranty Description	1 Year
Model Number	8M0047931
OEM Equivalent Part Number	8M0047931
Thread Size	RM
UPC	745061870192

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$49.43

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