10 Best engine flushes of 2025

Save up to 20% off

Best Choice

1

Liqui Moly

Liquimoly 2037 Pro-Line Engine Flush, 500 ml, 6 Pack
9.8

Exceptional

Our Rating
How do we rank?

Powerful technology We scan thousands of products and stores, analyzing reviews to find what matters most to users like you

Careful review Our team ensures quality, value, and fit based on real user feedback

Trusted insights AI and human analysis guide your decisions, reflecting real user priorities
Real users impact

Thousands of users trust our site daily

Based on millions of stores and reviews

Shoppers influence our rankings
Analyzing top stores
Value for Money

2

Generic
Liquii Moly Pro-Line Engine Flush (500 ML) - 3 PACK
Main highlights

Efficient Engine Cleaning
Liqui Moly Pro-Line Engine Flush provides a quick and thorough cleaning of both gasoline and diesel engines, ensuring optimal performance.

Versatile Use Cases
Ideal for use in both gasoline and diesel engines, compatible with catalytic converters, and gentle on engine seals.

Customer Favorite Feature
Customers praise its ability to clean without damaging engine components or affecting catalytic converters.
Key specs
- performance:Gentle and rapid cleaning
- engine protection:Neutral to seals
- compatibility:Compatible with catalytic converters
- friction reduction:N/A
- wear reduction:N/A
9.6

Exceptional

Our Rating
3

Liqui Moly
Liqui Moly Pro-Line Engine Flush | 500 ml | Oil additive | SKU: 2037
Main highlights

Efficient Engine Cleaning
Liqui Moly Pro-Line Engine Flush ensures gentle and rapid cleaning, maintaining engine health without damaging seals or materials.

Ideal for High-Mileage Vehicles
Perfect for gasoline and diesel engines, especially older models prone to oil sludge and carbon buildup.

Notable Customer Praise for Performance
Customers frequently commend the product for improving engine smoothness and reducing oil consumption.
Key specs
- Function:Clean and flush oil systems
- Volume:15.2 ounces
- Cleaning:Neutral to seals
- Ease of Use:Simple to use
- Performance:Gentle and rapid cleaning
9.4

Excellent

Our Rating

9.7
Simple to use

9.3
worth the money

9.1
Sheerness
4

Liqui Moly
Liqui Moly Engine Flush Plus 300ml
Main highlights

Key Features and Benefits
The product offers superior durability, user-friendly design, and exceptional performance, making it a reliable choice for various needs.

Ideal Use Cases
Perfect for both indoor and outdoor activities, versatile enough for professional and personal use.

Praised Feature from Reviews
Customers frequently commend the product's outstanding quality and excellent performance, highlighting its reliability and effectiveness.
9.2

Excellent

Our Rating

9.7
worth the money

9.7
materials Quality

9.7
lasts a long time
5

Triax

TRIAX Pro Engine Flush Oil-Based Deep Clean Motor Oil Flush Removes Sludge & Carbon | Non-Solvent | Safe for Engine, Seals, Injectors | Professional Shop Grade (16 Ounce)

20% Off
9.0

Excellent

Our Rating
See Today’s Deals & Prices
6

Liqui Moly

Liqui Moly motorspulung 500ML (2427) PRO LINE Engine Flush
8.8

Very Good

Our Rating
7

Gunk
Motor Flush 5 Min 32 fl oz (3 Pack)
Main highlights

Effective Engine Cleaner
Really great way to flush out built-up gunk in your motor and delivers on its promises.

Ideal for High-Mileage Vehicles
Perfect for vehicles with significant mileage, such as a Hyundai Elantra with 150,000 miles or a RAV 4 with 250,000 miles.

Increases Oil Pressure
Most customers praised the product for significantly increasing oil pressure and resolving warning lights and alarms.
8.7

Very Good

Our Rating
8

Liqui Moly
Liqui Moly MoS2 Anti-Friction Engine Treatment | 300 ml | Oil additive | SKU: 2009
Main highlights

High Load-Bearing Film
Forms a durable lubricant layer on all friction surfaces.

Ideal for High Mileage Engines
Perfect for engines needing smoother operation at high RPMs.

Noise Reduction Praised
Customers highlight significant reduction in engine noise and vibration.
Key specs
- performance:Improves engine sound
- engine protection:Anti-friction
- compatibility:Universal fit
- friction reduction:High load-bearing film
- wear reduction:N/A
8.6

Very Good

Our Rating

9.7
worth the money

9.1
Long life

9.1
distance
9

Rislone
Rislone 4102 XTREME LUBE® Maximum Performance Engine Treatment, 16.9 oz.
Main highlights

Reduces Friction and Wear
Rislone 4102 XTREME LUBE minimizes engine friction, enhancing performance and longevity.

Ideal for High Mileage Vehicles
Perfect for older cars with high mileage, ensuring smoother operation.

Quiets Noisy Lifters
Customers praise its ability to quiet noisy lifters and valves.
Key specs
- performance:XTREME LUBE Maximum Performance
- engine protection:Removes and prevents sludge
- compatibility:Add to engine oil
- friction reduction:Reduces friction and wear
- wear reduction:quiets noisy lifters
8.5

Good

Our Rating

9.9
Noise level

9.3
Simple to use

8.9
worth the money
10

MAATSEN
Liquii Moly Pro-Line Engine Flush (500 ML) - 2 PACK
Main highlights

Efficient Engine Cleaning
Provides a gentle and rapid cleaning of oil systems for both gasoline and diesel engines, ensuring optimal performance.

Versatile Compatibility
Ideal for vehicles with catalytic converters, offering safe and effective use without damaging engine seals or materials.

Customer Satisfaction
Praised for its ease of use and effective cleaning, earning a perfect 5-star customer review rating.
Key specs
- package dimensions:7.99 x 5.87 x 3.15 inches
- oem part number:2427
- flash point:N/A
- container type:N/A
- viscosity:N/A
8.3

Good

Our Rating

10 Best engine flushes of 2025

1

Liquimoly 2037 Pro-Line Engine Flush, 500 ml, 6 Pack

How do we rank?

How do we rank?

Analyzing top stores

2

Liquii Moly Pro-Line Engine Flush (500 ML) - 3 PACK

3

Liqui Moly Pro-Line Engine Flush | 500 ml | Oil additive | SKU: 2037

9.7

9.3

9.1

4

Liqui Moly Engine Flush Plus 300ml

9.7

9.7

9.7

5

TRIAX Pro Engine Flush Oil-Based Deep Clean Motor Oil Flush Removes Sludge & Carbon | Non-Solvent | Safe for Engine, Seals, Injectors | Professional Shop Grade (16 Ounce)

6

Liqui Moly motorspulung 500ML (2427) PRO LINE Engine Flush

7

Motor Flush 5 Min 32 fl oz (3 Pack)

8

Liqui Moly MoS2 Anti-Friction Engine Treatment | 300 ml | Oil additive | SKU: 2009

9.7

9.1

9.1

9

Rislone 4102 XTREME LUBE® Maximum Performance Engine Treatment, 16.9 oz.

9.9

9.3

8.9

10

Liquii Moly Pro-Line Engine Flush (500 ML) - 2 PACK

Sign up and get exclusive special deals