10 Best Engine Oil Additive of December 2025
List of Top Rated Engine Oil Additive from thousands of customer reviews & feedback.
Updated On Dec 2025
703 Reviews Studied
1
Rislone 4405 Engine Oil Supplement Concentrate with Zinc Treatment - 11 oz. Read Review
- Prevents camshaft wear
- Reduces piston scuffing
- Increases engine life
- Makes newer oils work in older engines
2
Liqui Moly (20002) Cera Tec Friction Modifier - 300 ml Read Review
- Mixable with all commercially available motor oils
- Stable even under high thermal and dynamic permanent loads
- No deposits and absolutely compatible with all commonly used filter systems
- Resists extremely high and low temperatures
3
Restore (00016 8-Cylinder Formula Engine Restorer & Lubricant - 16 oz. Read Review
- Restores cylinder compression
- Restores horsepower
- Restores engine performance
- Reduces oil consumption
4
Rislone 4102 Concentrated Engine Treatment, Conditioner and cleaner, 16.9oz Yellow Read Review
- Reduces friction and wear
- Quiets noisy lifters and valves
- Removes and prevents sludge
- Add to engine oil anytime
- Will not void manufacturer's new vehicle
5
TriboTEX Nano Oil Additive Car Engine Treatment: Add to Engine Lube - Makes High Mileage Cars Like New with a Synthetic... Read Review
- GROUNDBREAKING: Made in the USA – TriboTEX is a revolutionary engine oil additive. It contains synthetic nanoparticles developed with funding from the U.S. Department of Energy, NASA, & the National Science Foundation.
- QUIETER & SMOOTHER PERFORMANCE: Reverses wear in bearings by building a diamond-like carbon coating.
- UNIVERSAL: Compatible with all types of motor oil and can be used in gas or diesel engines. Use for both old and new cars. It is an excellent engine booster.
- EFFICIENT: Our masterfully engineered engine treatment improves fuel consumption and reduces engine noise. It is time to improve your engine and take your driving experience to a new level.
- GUARANTEED QUALITY: We know you will be delighted with this ground-breaking technology. Our treatment comes with a 100% satisfaction guarantee.
6
Prolong Super Lubricants PSL11000 Engine Treatment - 12 oz. Read Review
- Includes a Formula with Anti-Friction Metal Treatment Technology
- Features Engineering Designed to Treat Metal Surfaces of Both Gasoline and Diesel Fueled Engines
- Offers Molecules that Interact with Metal Surfaces and Chemically Bond to Create a Protective Layer that Reduces Damaging Friction and Heat
- Offers to Protect the Engine Even when the Motor Oil is Not Yet Fully Circulating
- Features a Formula Containing No Solid Particles Such as PTFE Resins, 'Molys', Zinc, Copper, or Graphite
7
LUCAS 10001 Heavy Duty Oil Stabilizer - 32 oz. Read Review
- The product is 32oz hd oil stabilizer
- Easy to use, increases power and miles per gallon
- Made in USA, increase oil life at least 50 percent longer
8
Liqui Moly 2009 Anti-Friction Oil Treatment - 300 ml Read Review
- Motor oil additive - Liqui Moly MoS2 anti-friction (300 ml. Can)
- Forms High load-bearing film of lubricant on all friction surfaces
- You will be surprised at how much better your engine sounds and how controlled it will be even at very high RPM
9
BestLine Premium Synthetic Engine Treatment with Nano Diamond Technology Extreme Pressure Lubricant for All Vehicles Gas... Read Review
- BESTLINE ENGINE TREATMENT: Increase power/gas mileage.
- REDUCES FRICTION: Diamond Nano-lubricant noise remover additive creates boundary layer protection on metal
- UNIVERSAL BESTLINE ADDITIVE: 100% Pure Synthetic use in gas or diesel car, truck, motorcycle engines
- OIL ADDITIVE: Use 1 bottle for every 5 quarts of oil for smoother starts & maximum engine protection
- TRY IT WITH CONFIDENCE: BestLine Engine Oil Treatment comes with a 100% money back guarantee
10
LUCAS LUC10130 Synthetic Oil Stabilizer. Quart Read Review
- Fit Type: Universal
- Use With Synthetic And Non-Synthetic Oils
- Through Creativity, Productivity And Innovation - This Brand Continues To Develop The Finest Automotive Accessories
- Country of origin : China