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 carbon deposits fast

🛠️OEM spec engineered

NT$1596

Duties & taxes included

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Description

⚡ Power up your engine’s potential with Mercury Quickleen!

FUEL SMART FORMULA - Just 1 oz revitalizes 5 gallons of gasoline, making maintenance effortless and cost-effective.
TRUSTED OEM QUALITY - Crafted by Mercury Marine to exacting original equipment standards for reliable, proven results.
CARBON CRUSHING POWER - Eliminates stubborn deposits from carburetors, injectors, valves & more for peak engine efficiency.
VERSATILE ENGINE CARE - Safe for all 2-stroke & 4-stroke carbureted and fuel-injected engines, including marine and powersports.
KNOCK FREE PERFORMANCE - Prevents engine knocking and piston seize-up, protecting your investment season after season.

Mercury 8M0047931 Quickleen Engine & Fuel System Cleaner is a premium 12 oz additive designed to remove carbon buildup and prevent engine knocking across a wide range of gasoline engines. Engineered to OEM specs by Mercury Marine, it treats 5 gallons of fuel per ounce and is safe for both 2-stroke and 4-stroke engines, ensuring cleaner combustion, extended spark plug life, and smoother performance throughout the season.

Specifications

ASIN	B003ZF1GJQ
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#16,604 in Automotive ( See Top 100 in Automotive ) #38 in Fuel System Cleaners
Brand	MERCURY
Brand Name	MERCURY
Compatible with Vehicle Type	Watercraft
Customer Reviews	4.8 out of 5 stars 843 Reviews
Included Components	1 Bottle
Manufacturer	Mercury Marine Mercruiser
Manufacturer Part Number	8M0047931
Manufacturer Warranty Description	1 Year
Model Number	8M0047931
Number of Items	1
Number of Packs	1
OEM Equivalent Part Number	8M0047931
Thread Size	RM
UPC	745061870192
Vehicle Service Type	Watercraft

Reviews

R**.

This stuff works well.

Excellent product. Got my motor running in tip top shape. Goid value.

3.05.2026

J**.

Worth the price.

Honestly when you're doing marine engineering work this product is top notch. Exceeded expectations. I use this multiple times through out the year and I noticed a difference. Quality fuel system cleaner. Not cheap but works.

1.12.2025

A**S

Simple to use, and no worries about over dosing your fuel system or hurting any components

By far 1 of the best complete fuel system cleaners I've used. Cleans out all of the plaque build up and carbon deposits in your fuel system.

12.07.2026

M**K

Excellent product

Really good stuff. Notable performance improvement after using this

31.12.2025

R**O

Very good luck with this product resolving issues!

I have used this product two seasons to treat the engine for build up and had good results where some engine sputtering or bad gas issues were either causing full throttle power issues or sputtering. In both instances refreshing the fuel and using this product I was able to get back to the engine running at full throttle with no issues. I change the fuel filter regularly and do use a marine treatment for ethanol however I think intermittent use of this product helps with carbeurator issues IMHO.

26.05.2021

D**.

Satisfied customer

Good price and speedy delivery. Will order again!

8.08.2026

P**R

Yes

Good

13.07.2026

R**R

Cleans well

Bought more than once. Cleared sputtering and hard to start engines on power generators and lawn mowers well. Highly recommend.

28.11.2025

B**.

Works

Good product

2.08.2025

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NT$1596

Duties & taxes included

In stock

Sold byAmazon TaiwanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Taiwan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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