Best Transmission Additives In July 2025

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In this article, we will present the top 10 Best Transmission Additives available on the market, along with our expert reviews. Get one of them and have fun! You’ll love it!

To help you in your search, we have completed this list of the Best Transmission Additives.

Top Rated Best Transmission Additives Of 2025

Rank	Product Name	Score
1	LUCAS LUC10009 Transmission Fix 24 oz, Brown Buy Now	9.7 Buy Now
2	XADO Revitalizant EX120 Conditioner for Automatic Gearbox & CVT Tiptronic Transmission Oil Treatment Buy Now	9.5 Buy Now
3	Lubegard 63010 Platinum Universal ATF Protectant, 10 oz Buy Now	9.1 Buy Now
4	LUCAS OIL 10441 Automatic Transmission Fluid Conditioner, 20 oz Buy Now	8.8 Buy Now
5	Lubegard 60902 Automatic Transmission Fluid Protectant, 10 oz Buy Now	8.6 Buy Now
6	Liqui Moly 20040 ATF Additive Buy Now	8.3 Buy Now
7	Slick 50 41806015 Recharged High Mileage Automatic Transmission and Engine Treatment, 15-Ounce Buy Now	8.1 Buy Now
8	Prolong Super Lubricants PSL15000 Transmission Treatment - 8 oz Buy Now	7.8 Buy Now
9	zMax 51-306 Transmission Formula, 6 oz Buy Now	7.5 Buy Now
10	Bar's Leaks 1416 Super Transmission Fix - 16.9 oz Buy Now	7.2 Buy Now

1. LUCAS LUC10009 Transmission Fix 24 oz, Brown

• Lucas transmission fix stops slip, hesitation, rough shifting in worn transmissions and completely eliminates most seal leaks

2. XADO Revitalizant EX120 Conditioner for Automatic Gearbox & CVT Tiptronic Transmission Oil Treatment

• Increases performance reliability and prolongs service life of control gears
• Rebuilds and restores metal parts and protects them from future wear.
• Universal for automatic, cvt, tiptronic, manumatic, semi-automatic transmission
• Stops transmission shudder, reduces noise & vibration. ultimate stop slipping additive
• Anti friction modifier. eliminates surfaces defects & protects from extreme heat

3. Lubegard 63010 Platinum Universal ATF Protectant, 10 oz

• Does not contain any harmful components such as zinc (zddp)/ash, etc., like other competing products, frees stuck valves and keeps them free, ensures proper shifts
• The original universal atf protectant that eliminates atf confusion and the need to stock multiple atf's - dramatically reduces friction and wear on metal parts and internal components
• Contains patented synergol tms technology, a synthetic molecule that tightens the shift cycle without losing the friction modification at lockup, which eliminates shudder
• Extends fluid change intervals, protects and restores seals for optimum performance, conditions and restores seals and o-rings
• Will not alter the crucial sulfur balance in your transmission fluid, prevents overheating, will not harm yellow metals, inhibits fluid oxidation and foaming

4. LUCAS OIL 10441 Automatic Transmission Fluid Conditioner, 20 oz

• A special blend of lucas additives designed to prevent slipping, leaks and wear in automatic transmissions
• Through creativity, productivity and innovation - this brand continues to develop the finest automotive accessories
• Improves shifting, reduces noise and shudder, extends fluid life

5. Lubegard 60902 Automatic Transmission Fluid Protectant, 10 oz

• Only protectant that increases the fluids ability to transfer heat / protects new seals and permanently restores older seals to a like-new condition, without adverse side effects
• Prevents overheating, reducing elevated operating temperatures up to 40 degrees farenheit - optimizes total transmission performance
• Eliminates transmission fluid foaming and oxidation and reduces wear throughout the transmission
• Extends fluid life / raises the thermal and oxidative stability of the fluid
• Eliminates clutch chatter and torque converter shudder, softens and modifies harsh shifts making them quicker in duration

6. Liqui Moly 20040 ATF Additive

• Regenerates seals, cleans and protects
• Damps down shifting operations and protects from wear
• Prevents oil loss
• Lowers repair costs and lengthens the service life
• Improve steering characteristic and reduced the noise

7. Slick 50 41806015 Recharged High Mileage Automatic Transmission and Engine Treatment, 15-Ounce

• Can be added anytime or while doing a transmission fluid change, leave adequate fill space
• Prevents transmission leaks and aids high mileage transmissions by lubricating seals
• Helps erratic shift and loss of torque
• Restores atf additive content and provides additional protection to transmissions
• Helps eliminate transmission shudder

8. Prolong Super Lubricants PSL15000 Transmission Treatment - 8 oz

• Offers to treat the metal surfaces of both standard (manual) and automatic transmissions
• Features engineering designed to treat metal surfaces through a molecular and chemical process
• Offers molecules that interact with metal surfaces and chemically bond to create a protective layer that reduces damaging friction and heat
• Includes a formula with anti-friction metal treatment technology
• Features a formula that promotes smoother manual shifts and helps restore responsiveness in automatic transmissions

9. zMax 51-306 Transmission Formula, 6 oz

• Reduced wear on vital parts
• Improved shifting
• Improved performance
• Not for use in cvt transmissions

10. Bar's Leaks 1416 Super Transmission Fix - 16.9 oz

• Bar's leaks super transmission fix is a synthetic blend treatment for transmission fluid, seals, metal surfaces, bands and clutch plates.
• Renews worn bands
• Works in all automatic, manual, cvt, & dual clutch transmissions
• Stop slipping, rough shifting, & seals fluid leaks
• Reduces noise