10 Best line motor oil treatments of 2025

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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)

12% Off
9.9

Exceptional

Our Rating
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Value for Money

2

DNL
BestLine Racing Super Concentrate - Diamond Nano-Lubricant Engine Oil Additive Reduces Wear, Noise, Vibration - Boosts Fuel Economy & Horsepower. Made in the USA, One Bottle Treats 5-quarts of oil.
Main highlights

Ultra-Low Friction Film
Reduces engine friction by 60% with Diamond Nano-coating.

Versatile Vehicle Compatibility
Ideal for all vehicles, from go-carts to commercial trucks.

Improved Engine Performance
Smooth idling and reduced noise praised by customers.
9.8

Exceptional

Our Rating

9.1
distance

8.9
worth the money
3

Red Line

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

14% Off
9.7

Exceptional

Our Rating
4

STP
STP High Mileage Oil Treatment + Stop Leak - 15 FL OZ
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
9.6

Exceptional

Our Rating

9.7
Simple to use

9.5
distance

9.3
worth the money
5

LUCAS OIL
LUCAS OIL High Mileage Oil Stabilizer

16% Off
Main highlights

Outstanding Engine Protection
Lubricates all internal parts to minimize wear and increases oil pressure, enhancing engine longevity.

Ideal for High Mileage Vehicles
Perfect for vehicles with over 200,000 miles, reducing noise and oil consumption.

Smooth and Quiet Operation
Most praised for making engines run smoother and quieter, as noted by customers.
Key specs
- package dimensions:11.75 x 3.3 x 3.3 inches
- oem part number:10118
- liquid volume:1 Quart
- flash point:N/A
- container type:N/A
9.5

Excellent

Our Rating

9.9
Simple to use

9.9
Flavor

9.5
Long life
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6

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
- friction reduction:High load-bearing film
- compatibility:Universal fit
- emission control:N/A
9.4

Excellent

Our Rating

9.7
worth the money

9.1
Long life

9.1
distance
7

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.
9.2

Excellent

Our Rating

9.7
worth the money

9.7
distance

9.7
Long life
8

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
- friction reduction:Reduces friction and wear
- compatibility:Add to engine oil
- emission control:N/A
9.1

Excellent

Our Rating

9.9
Noise level

9.3
Simple to use

8.9
worth the money
9

STP
STP Ceramic Oil Treatment, Protective Coating and Anti-Friction Technology, 15 Oz (19387)
Main highlights

Ceramic Coating Protection
Ceramic coating protects engine for up to 15,000 miles, reducing wear and tear.

Ideal for Older Engines
Best used in older vehicles to enhance performance and lifespan.

Engine Smoothness
Significantly reduces engine noise and vibration, improving overall smoothness.
Key specs
- performance:Improves gas mileage
- engine protection:Prevents engine deposits
- friction reduction:Improves lubrication
- compatibility:Conventional or synthetic oils
- emission control:Reduces emissions
9.0

Excellent

Our Rating
10

Liqui Moly
LIQUI MOLY Motor Oil Saver | 300 ml | Oil additive | SKU: 2020
Main highlights

Reduces_Oil_Consumption_and_Prevents_Leaks
Liqui Moly Motor Oil Saver reduces oil consumption and prevents leaks through regeneration of engine seals.

Ideal_for_Aging_Engines_with_Seal_Issues
Best used in vehicles with aging engines experiencing oil leaks or consumption due to worn seals.

Highly_Effective_in_Reducing_Oil_Loss
Praised by customers for significantly reducing oil loss and preventing exhaust smoke.
Key specs
- performance:Reduces oil consumption
- engine protection:Regenerates engine seals
- friction reduction:N/A
- compatibility:N/A
- emission control:Prevents smoky exhaust
8.9

Very Good

Our Rating

8.7
worth the money

8.7
distance

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

BestLine Racing Super Concentrate - Diamond Nano-Lubricant Engine Oil Additive Reduces Wear, Noise, Vibration - Boosts Fuel Economy & Horsepower. Made in the USA, One Bottle Treats 5-quarts of oil.

9.1

8.9

3

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

4

STP High Mileage Oil Treatment + Stop Leak - 15 FL OZ

9.7

9.5

9.3

5

LUCAS OIL High Mileage Oil Stabilizer

9.9

9.9

9.5

6

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

9.7

9.1

9.1

7

Lucas Oil 10001 Heavy Duty Oil Stabilizer - 1 Quart

9.7

9.7

9.7

8

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

9.9

9.3

8.9

9

STP Ceramic Oil Treatment, Protective Coating and Anti-Friction Technology, 15 Oz (19387)

10

LIQUI MOLY Motor Oil Saver | 300 ml | Oil additive | SKU: 2020

8.7

8.7

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