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All in all, we spent hundreds of hours combing through thousands of user reviews to put together a comprehensive list of the best additive oil on the market. We then delved into these additive oil further and put together detailed reviews so that you can easily pick the best additive oil for your needs.

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Best additive oil reviews

1. Lucas Oil 10063 Engine Break-in Oil Additive - 16 oz, Multi-Colored (LUC10063)

Feature

Lucas Engine Break-In Oil Additive Protects Camshaft Lifters And Valve Train During Break-In Periods Of Motors
It Is Excellent For Flat Tappet Camshafts During Break-In Or As An Additive To Any Motor Oil To Prevent Premature Wear
Through Creativity, Productivity And Innovation - This Brand Continues To Develop The Finest Automotive Accessories

2. ZDDPPlus ZDDP Engine Oil Additive Zinc & Phosphorus 2 Bottles

Feature

PROTECT YOUR ENGINE - Older cars with flat tapped lifters-cam need the added zinc for protection
EASY TO USE - Simply empty entire 4oz contents of the bottle to a 4 to 6 quart oil change.
PREVENT METAL ON METAL CONTACT - ZDDPlus alters characteristics to prevent metal on metal contact
FOR USE ON PRE 1989 AND HIGH PERFORMANCE ENGINES
COMPATIBLE WITH SYNTHETIC AND CONVENTIONAL MOTOR OILS

3. Rislone 4405 Engine Oil Supplement Concentrate with Zinc Treatment - 11 oz.

Feature

Prevents camshaft wear
Reduces piston scuffing
Increases engine life
Makes newer oils work in older engines

4. REV X ZDDP Oil Additive - Zinc for Flat Tappet Cams & Engine Break in (1)

Feature

Treats 6 Quarts - The most concentrated form of ZINC (ZDDP) Additive available. 3000-3200 parts per million when blended with 6 quarts of oil.
Provides Maximum Protection For Engine Break In.
Protects Flat Tappet Camshafts (Hydraulic or Solid).
Provides increased lubrication of Roller Lifter Bearings (Hydraulic or Solid).
Provides Maximum Metal To Metal Protection.

5. Marvel Mystery Oil MM12R - 16 Fl Oz. (Pack of 2)

Feature

Kit Includes (2) 16oz. Bottles of Marvel Mystery Oil additive
Cleans and lubricates fuel injectors and carburetors
Reduces and prevents varnish and gum build-up
Prevents valve sticking and clatter
Prevents oil breakdown caused by extreme temperatures

6. LUCAS LUC10130 Synthetic Oil Stabilizer. Quart

Feature

Fit Type: Universal

7. Lucas 32 Ounce 10001 Heavy Duty Oil Stabilizer-32 Oz

Feature

For best performance, follow the manufacturer's recommendations in your vehicle owners manual.
Increase oil life at least 50 percent longer
Reduces oil consumption
Eliminates dry starts
Raises oil pressure
Increases power and miles per gallon

8. CamGuard Oil Additive (Aircraft)

Feature

For Aircraft Engines Only- 16 Oz Bottle
Fights Rust and Corrosion
Reduces Cam and Lift Wear
Prevents Engine Deposits
Conditions Seals

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

Feature

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

10. REV X Stiction Fix Oil Treatment - Two 4 fl. oz. Bottles

Feature

Two 4 fl. oz. bottles of REV X High Performance Oil Additive in our stiction fix retail box. Will treat up to 12 quarts of oil.
Quiets engine noise while cleaning harmful deposits, varnish and sludge in all engines. Reduces friction by creating a microscopic friction reduction layer on all treated components to reach areas standard oils can not.
Removes stiction, common in HEUI Injectors, without using harmful and dangerous chemical strippers.
Extends the service life of all synthetic, semi-synthetic, and mineral based oils providing a reduction of wear of all treated engine components.
Greatly improves or eliminates cold start issues in all diesel engines.

11. REV X High Performance Oil Additive (4)

Feature

Increased efficiency, horsepower and torque
Greatly Iimproved cold start operation
Smoother operation of all treated components
Enhances injection systems for proper operation
Four - 4oz engine oil treatment kit

12. REV X Super Ultimate Kit for Diesel - 4oz High Performance Oil Additive (2) + 8oz Ultimate Fuel Treatment (2)

Feature

Greatly Improves Starting In Cold Weather and Dissolves Stiction in Powerstroke Diesels.
Increases Efficiency, Horsepower, Torque & Lubrication Service Life.
REV X is safe for all Soft and Exotic Metals.
Reduces Exhaust Emissions and Diesel Smoke.
Cleans entire Fuel System and Oil System. Ultimate goes in the fuel tank and Oil Additive Goes in your Engine.

13. REV X ZDDP Oil Additive - Zinc for Flat Tappet Cams & Engine Break in (5)

Feature

1 Bottle Treats 6 qts. of oil - The most concentrated form of ZINC (ZDDP) Additive available. 3000-3200 parts per million when blended with 6 quarts of oil.
Provides Maximum Protection For Engine Break In.
Protects Flat Tappet Camshafts (Hydraulic or Solid).
Provides increased lubrication of Roller Lifter Bearings (Hydraulic or Solid).
Provides Maximum Metal To Metal Protection.

14. BestLine Premium Synthetic Engine Treatment with Nano Diamond Technology Extreme Pressure Lubricant for All Vehicles Gas or Diesel Cars Trucks 12 oz

Feature

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

15. REV X High Performance Oil Additive - 4 fl. oz. Bottle

Feature

4 fl. oz. bottle of REV X High Performance Oil Additive. Will treat up to 6 quarts of oil per bottle.
Quiets engine noise while cleaning harmful deposits, varnish and sludge in all engines. Reduces friction by creating a microscopic friction reduction layer on all treated components to reach areas standard oils can not.
Removes stiction, common in HEUI Injectors, without using harmful and dangerous chemical strippers. For HEUI Injector Stiction, it is recommended to use two 4 fl. oz. bottles.
Extends the service life of all synthetic, semi-synthetic, and mineral based oils providing a reduction of wear of all treated engine components.
Greatly improves or eliminates cold start issues in all engines. Works great in all gas powered engines.

Conclusion

All above are our suggestions for additive oil. This might not suit you, so we prefer that you read all detail information also customer reviews to choose yours. Please also help to share your experience when using additive oil with us by comment in this post. Thank you!