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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Mercury 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

🔥Prevents engine knocking

⚙️Removes carbon buildup

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₨807

Duties & taxes included

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Description

⚡ Unlock your engine’s hidden potential—clean smarter, drive stronger!

ENGINE GUARDIAN - Stops knocking and piston seize-up, extending engine life and performance reliability.
DEEP CLEAN POWER - Eradicates carbon deposits from carburetors, injectors, valves & more for peak engine efficiency.
FUEL SMART FORMULA - Just 1 oz revitalizes 5 gallons of gasoline—maximize every drop with minimal effort.
OEM TRUSTED QUALITY - Crafted by Mercury Marine to exacting OEM standards—engine care backed by decades of expertise.
VERSATILE COMPATIBILITY - Safe for all 2-stroke & 4-stroke engines including marine, automotive, powersports & lawn equipment.

Mercury 8M0047931 Quickleen Engine & Fuel System Cleaner is a professional-grade additive designed to remove stubborn carbon deposits and prevent engine knocking across a wide range of gasoline engines. With just 1 ounce treating 5 gallons of fuel, it ensures efficient fuel system maintenance, prolongs spark plug life, and is trusted by Mercury Marine for OEM-level quality and performance.

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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