10 Best line motor oil treatments of 2025

Save up to 42% off

Best Choice

1

Prolube

Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear, Noise, Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (16oz)
9.9

Exceptional

Our Rating
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Value for Money

2

Red Line

Red Line 81403 Engine Oil Break-In Additive - 16 Ounce

14% Off
9.8

Exceptional

Our Rating
3

Lucas Oil
Lucas Oil 10016 Complete Engine Treatment - 16 Ounce
Main highlights

Comprehensive Engine Care
Cleans and lubricates the entire fuel system, improving engine efficiency and reducing emissions.

Ideal for Regular Maintenance
Best used for upkeep between oil changes, not for serious engine repairs.

Highly Rated Performance
Praised for reducing engine pinging and improving overall maintenance.
9.7

Exceptional

Our Rating

8.7
distance

8.2
worth the money

8.0
Long life
4

STP

STP 65148 15 Oz Oil Treatment

26% Off
9.6

Exceptional

Our Rating

9.7
worth the money

9.7
distance
5

Lucas Oil
Lucas Oil 10003 Fuel Treatment - 1 Quart
Main highlights

Fuel System Efficiency
Cleans and lubricates the fuel system, improving MPG and reducing emissions.

Versatile Application
Ideal for gasoline and diesel engines, including older engines needing lead replacement.

Customer Praised Performance
Highly effective in restoring engine power and smooth operation.
9.3

Excellent

Our Rating

9.9
Simple to use

9.7
worth the money

9.5
Long life
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6

Lucas Oil
Lucas Oil 10001 Heavy Duty Oil Stabilizer - 1 Quart
Main highlights

Key Features
100% petroleum-based, enhances engine performance, suitable for new engines, and offers multi-use versatility. Trusted by professionals for demanding conditions.

Ideal Use Cases
Optimal for keeping new engines running smoothly, ideal for high-performance vehicles, and versatile for various engine types.

Customer Reviews
Most praised for significantly improving engine performance and lifespan, with noticeable smoothness in engine operation.
9.1

Excellent

Our Rating

9.7
worth the money

9.7
distance

9.7
Long life
7

STP
STP High Mileage Oil Treatment + Stop Leak Engine Oil Additive, 15 fl oz, Contains ZDDP Anti-Wear Agent to Fight Friction, Rejuvenates Seals and Gaskets, Stops Leaks
Main highlights

Wear Protection
ZDDP additive prevents wear, protecting high-mileage vehicles.

Ideal for High Mileage
Perfect for vehicles over 75,000 miles, rejuvenates seals.

Noise Reduction
Commonly praised for significantly reducing engine noise and vibrations.
Key specs
- Functionality:Prevents leaks and wear
- Dimensions:7.22 x 3.65 x 1.85 inches
- Operation:Add during oil change
- Compatibility:Vehicles with 75,000+ miles
- Pressure Range:N/A
9.0

Excellent

Our Rating

9.7
Simple to use

9.5
distance

9.3
worth the money
8

Red Line
Red Line 40603 Two-Stroke Oil Racing Synthetic - 16 Ounce
Main highlights

Ultimate Performance and Cleanliness
Ultimate in two-cycle performance, extreme cleanliness. Dyno proven for gains of 3-5 and more power over longer runs. High-temp stability prevents deposits.

Ideal for Racing and Daily Applications
Popular in racing and daily applications like motorcycles, marine, snowmobile racing, etc. Suggested use at 50:1, but useful up to 100:1 depending on operating conditions.

Praised for Clean Burning and Quality
Very clean burning and high quality. Customers appreciate its durability and effectiveness, noting minimal deposits and improved engine performance.
8.7

Very Good

Our Rating
9

Lucas Oil
Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart
Main highlights

Stops Leaks Effectively
Lucas Oil Stop Leak helps reduce and prevent engine oil leaks.

Ideal for Temporary Fixes
Perfect for temporary oil leak fixes before permanent repairs.

Praised for Leak Prevention
Customers love its effectiveness in stopping and preventing leaks.
8.6

Very Good

Our Rating

9.3
Long life

8.7
Simple to use

8.4
worth the money
10

Lucas Oil
Lucas Oil 10977 High Mileage Fuel Treatment - 5.25 Ounce

42% Off
Main highlights

Cleans and Protects Engine
Lucas Oil 10977 cleans fuel injectors, reduces deposits, and lubricates critical components for enhanced engine performance.

Ideal for Older Vehicles
Perfect for older engines, reducing oil contamination and improving smoothness.

Improves Engine Smoothness
Customers praise its ability to make engines run smoother and reduce knocking.
Key specs
- product dimensions:1.6 x 1.6 x 7.5 inches
- item size:5.25 Ounce
- special features:Clean fuel injectors
- fuel type:N/A
- package dimensions:N/A
8.5

Good

Our Rating

10 Best line motor oil treatments of 2025

1

Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear, Noise, Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (16oz)

How do we rank?

How do we rank?

Analyzing top stores

2

Red Line 81403 Engine Oil Break-In Additive - 16 Ounce

3

Lucas Oil 10016 Complete Engine Treatment - 16 Ounce

8.7

8.2

8.0

4

STP 65148 15 Oz Oil Treatment

9.7

9.7

5

Lucas Oil 10003 Fuel Treatment - 1 Quart

9.9

9.7

9.5

6

Lucas Oil 10001 Heavy Duty Oil Stabilizer - 1 Quart

9.7

9.7

9.7

7

STP High Mileage Oil Treatment + Stop Leak Engine Oil Additive, 15 fl oz, Contains ZDDP Anti-Wear Agent to Fight Friction, Rejuvenates Seals and Gaskets, Stops Leaks

9.7

9.5

9.3

8

Red Line 40603 Two-Stroke Oil Racing Synthetic - 16 Ounce

9

Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart

9.3

8.7

8.4

10

Lucas Oil 10977 High Mileage Fuel Treatment - 5.25 Ounce

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