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10 Best Engine Oil Additives

Last Updated October 2019

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Lucas Oil

Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart

9.9

Superb!

Lucas Oil 10278 Engine Oil Stop Leak Review and Comparison

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Renews worn seals with no risk of damage or eventual corrosion
Compatible with petroleum, semi-synthetic and full synthetic motor oils
Reduces engine noise and oil consumption, while raising oil pressure

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ZDDPPlus ZDDP Engine Oil Additive Zinc & Phosphorus 2 Bottles

9.5

Superb!

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Product Highlights

Easy to use - simply empty entire 4oz contents of the bottle to a 4 to 6 quart oil change.
For use on pre 1989 and high performance engines
Protect your engine - older cars with flat tapped lifters-cam need the added zinc for protection
Prevent metal on metal contact - zddplus alters characteristics to prevent metal on metal contact
Compatible with synthetic and conventional motor oils

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Best Value

Liqui Moly

Liqui Moly 20004 Hydraulic Lifter Additive

9.2

Superb!

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Product Highlights

Cleans valve bores
Prevents engine noises caused by hydraulic tappets
Improves the lubrication properties of the oil
Suitable for use in vehicles with turbochargers and vehicles with catalytic converters

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Liqui Moly

Liqui Moly 2020 Motor Oil Saver - 300 ml

9.0

Superb!

Liqui Moly 2020 Motor Oil Saver - 300 Review and Comparison

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Prevents blue, smoky exhaust fumes
Regenerates engine seals made of plastic and rubber
Reduces oil consumption via the piston rings and valve guides
Prevents leaks due to leaks at elastomeric seals
Prevents pollution of the environment due to oil dripping from the engine

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7.9 Reviews

How we Score

9.5 features quality

8.9 popularity

8.4 brand reputation

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Our app considers products features, online popularity, consumer’s reviews, brand reputation, prices, and many more factors, as well as reviews by our experts.

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BestLine Superior Lubricants

BestLine 853796001049 Premium Synthetic Engine Treatment for Gasoline Engines - 16 oz

8.6

Great

BestLine 853796001049 Premium Synthetic Engine Treatment for Gasoline Review and Comparison

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Visible benefits: this engine treatment reduces the likelihood of low-speed, pre-ignition, reduces friction for improved fuel mileage, and offers protection against engine wear.
Universally compatible: this product can be used on a variety of new or old automobiles. bestline is compatible with all types of motor oil and can be used in gas or diesel engines.
Long lasting engine: bestline uses its revolutionary formula to provide your vehicle with maximum engine life protection, proven to increase the life of your engine by 80%!
100% pure synthetic: bestline's superior lubricant has been formulated with a 20 weight full-synthetic base oil, designed specifically for longer drain intervals.
Trust bestline: our product is unique in that it is the only engine treatment with 52 worldwide patents. if you are not satisfied with bestline, we offer a 100% money back guarantee.

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Competition Cams 159 Engine Break-In Oil Additive, 12 oz. Bottle

8.3

Great

Competition Cams 159 Engine Break-In Oil Additive, 12 Review and Comparison

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Protects all internal engine components, including flat tappet and roller valve trains
Requires no additives or supplements for maximum protection
Improves surface mating of rotating assembly, rod journals, piston rings, valve guides, cam and lifters, etc.
Proprietary additive package includes optimum amounts of zddp (zinc and phosphorus), molybdenum and detergents
Fully compatible with gasoline, methanol and high octane race fuel

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Liqui Moly 2009 Anti-Friction Oil Treatment - 300 ml

8.1

Great

Liqui Moly 2009 Anti-Friction Oil Treatment - 300 Review and Comparison

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Forms high load-bearing film of lubricant on all friction surfaces
Motor oil additive - liqui moly mos2 anti-friction (300 ml. can)
You will be surprised at how much better your engine sounds and how controlled it will be even at very high rpm

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Rislone Engine Oil Supplement Concentrate - 11 oz

7.8

Very Good

Rislone Engine Oil Supplement Concentrate - 11 oz Review and Comparison

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Reduces piston scuffing
Prevents camshaft wear
Increases engine life

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Restore (00016) 8-Cylinder Formula Engine Restorer and Lubricant - 16 oz

7.6

Very Good

Restore (00016) 8-Cylinder Formula Engine Restorer and Lubricant Review and Comparison

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Restores horsepower
Reduces oil consumption
Restores cylinder compression
Restores engine performance

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Liqui Moly 2009 Anti-Friction Oil Treatment -pk6

7.1

Very Good

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Product Highlights

• less heat, smooth running, reduced fuel consumption
• perfected for engines used in high load applications like extended towing and full throttle driving conditions
• substantially reduces wear & extends engine life
• enhances the life of engine oil and oil treatments

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