10 Best engine flushes of 2026

Explore top picks

1

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
- viscosity:N/A
- friction reduction:N/A
9.7

Exceptional

Our Rating
How do we rank?

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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
2

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
9.5

Excellent

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
9.3

Excellent

Our Rating

9.7
Simple to use

9.3
worth the money

9.1
Sheerness
4

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
9.1

Excellent

Our Rating

9.7
Simple to use

9.3
worth the money

9.1
Sheerness
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 oz - 473 ml)
8.8

Very Good

Our Rating
See Today’s Deals & Prices
6

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 oz - 473 ml)
8.5

Good

Our Rating
7

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
8

Liqui Moly

Liqui Moly motorspulung 500ML (2427) PRO LINE Engine Flush
8.1

Good

Our Rating
9

Liqui Moly

Liqui Moly motorspulung 500ML (2427) PRO LINE Engine Flush
7.9

Good

Our Rating
10

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.
7.7

Good

Our Rating

9.7
worth the money

9.7
materials Quality

9.7
lasts a long time

10 Best engine flushes of 2026

1

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

How do we rank?

How do we rank?

Analyzing top stores

2

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

3

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

9.7

9.3

9.1

4

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

9.7

9.3

9.1

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 oz - 473 ml)

6

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 oz - 473 ml)

7

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

8

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

9

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

10

Liqui Moly Engine Flush Plus 300ml

9.7

9.7

9.7

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