10 Best Automatic Transmission Additive of December 2025

• Lucas Transmission Fix Stops Slip, Hesitation, Rough Shifting In Worn Transmissions And Completely Eliminates Most Seal Leaks
• Fit Type: Universal
• Can be added to existing fluid without draining any out
• Improves shifting

LUCAS

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

Slick 50

• PROTECT YOUR VEHICLE: zMAX Transmission Formula is easy to use! Micro-lubrication soaks into metal surfaces improving lubrication to reduce gear wear and varnish buildup. Keeps seals supple, preventing leaks and improving shifting.
• TRANSMISSION EFFICIENCY: Improve performance by adding the formula to your transmission fluid to reduce slippage and rough shifting. Brings back smooth shifting gears resulting in an improved response. Add every time you change your transmission fluid.
• TRANSMISSION LUBRICANT: Cleans varnish for smoother shifting and lubricates bearings, gears, and the hydraulic system. Perfect for both automatic or manual transmissions. Not for use in CVT transmissions. Does not void manufacturer's warranties.
• ECONOMICAL PREVENTATIVE MAINTENANCE: Pour into transmission fluid to keep the gears lubricated and in top condition. The eco-friendly formula is industry tested, mechanic trusted and improves the performance and the driving experience.
• TRUSTED QUALITY AND PERFORMANCE: zMAX is proud to be the Official Micro-lubricant of Speedway Motorsports. Trusted for over 80 years, the USA made Transmission Formula saves money at the pump and extends the engine life of all your vehicles.

zMAX

• Reduces operating temperatures
• Eliminates station from all automatic & CVT transmissions
• Reduces coefficient of friction
• Transmission station eliminator minimizes metal to metal contact
• Eliminates rust & corrosion

Hot Shot's Secret

• Repair Transmission
• Restores Surfaces and Protects Friction Metal Parts From Wear
• Eliminates Surface Defects
• Increases Performance Reliability and Prolongs Service Life Span of Control Mechanisms
• Reduces Noise and Vibrations

XADO

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

Liqui Moly

• Rebuilds And Restores Metal Parts And Protects Them From Future Wear.
• Anti Friction Modifier. Eliminates Surfaces Defects & Protects From Extreme Heat
• Stops Transmission Shudder, Reduces Noise & Vibration. Ultimate Stop Slipping Additive
• Increases Performance Reliability And Prolongs Service Life Of Control Gears
• Universal for Automatic, CVT, Tiptronic, Manumatic, Semi-Automatic Transmission

XADO

• 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
• Eliminates clutch chatter and torque converter shudder; Softens and modifies harsh shifts making them quicker in duration
• Extends fluid life / Raises the thermal and oxidative stability of the fluid
• Only protectant that increases the fluid’s ability to transfer heat / Protects new seals and permanently restores older seals to a like-new condition, without adverse side effects

Lubegard

• Improves shifting
• Extends fluid life
• AFFORDABLE SOLUTIONS
• Reduces noise and shudder

Lucas Oil

• 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
• Eliminates clutch chatter and torque converter shudder; Softens and modifies harsh shifts making them quicker in duration
• Extends fluid life / Raises the thermal and oxidative stability of the fluid
• Only protectant that increases the fluid's ability to transfer heat / Protects new seals and permanently restores older seals to a like-new condition, without adverse side effects

Lubegard