10 Best Transmission Additives in 2023 [Wide Compatibility]


Transmission additives are chemicals or compounds that are added to the transmission fluid to improve its performance. They can be used to reduce friction, wear and tear on the transmission system, or to improve performance in specific areas. Transmission additives can also help keep the transmission clean and free of debris.

Best Overall
1
4.9
Liqui Moly 1040 Gearbox Oil Additive

Liqui Moly 1040 Gearbox Oil Additive

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  • The MoS2 additive builds a durable film of lubrication on a rubbing and sliding surfaces Prevents rubbing and wear and disperses temperature peaks
  • For gearbox, driveshaft and differentials - especially under high thermal loading Contents are enough for up to 1 litre of gearbox oil Not for motorcycles with a wet clutch
  • Contains highly concentrated MoS2 to reduce wear in manual and differential transmissions, axle drives without integrated wet differential locks and mechanical steering systems
  • MoS2 reduces temperature peaks and ensures quieter running and smoother shifting
  • The transmission heats up less and benefits from smoother tooth faces in terms of quieter running and improved performance
Best Runner-Up
2
4.8
Sea Foam TT-16 Trans Tune Transmission Additive

Sea Foam TT-16 Trans Tune Transmission Additive

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  • Helps fluid systems work smoother & last longer
  • Dissolves & liquefies harmful gum & varnish buildup in fluid
  • Cleans & lubricates valve bodies, shift actuators & solenoids
  • Controls moisture & Safe for conventional & synthetic fluids
  • Safe in most types of automatic transmission fluid, hydraulics, or power steering fluid systems
Best for Restores elasticity
3
4.7
XADO Atomex Sealer Stop-leak Additive

XADO Atomex Sealer Stop-leak Additive

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  • Restores elasticity of rubber seals and gaskets
  • Eliminates leakages in the future
  • Improves “seal-metal” contact
  • Eliminates the need for expensive repair
  • Compatible with all types of oils for mechanical transmissions
Best Durability
4
4.6
Xado EX120 Additive for Manual Transmission

Xado EX120 Additive for Manual Transmission

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  • Reinforced restoration repair and wear protection of injection systems.
  • Safety data sheet available on request for professional users
Best Reduces fuel consumption
5
4.5
XADO Set Engine Oil Additive

XADO Set Engine Oil Additive

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  • Restoration of engine compression ¨ Repair of engine surfaces ¨ Suitable for off-road vehicles
  • Provides active protection against overload and overheating extends service life.
  • Increases the engine performance Lowers noise and vibration.
  • Restores the surfaces of the components and compensates for running wear
  • Reduces fuel consumption Ensures reliable protection against inferior fuel.
Best Reliability
6
4.4
Liqui Moly 5135 P000019 ATF additives

Liqui Moly 5135 P000019 ATF additives

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  • Content: 250ml
  • Optimally cares for rubber and plastic seals in steering gears and automatic transmissions
  • Leaks on transmissions and gears, caused by hardened and brittle seals, are prevented and eliminated
  • The contents of 250 ml are sufficient for up to 8 l oil volume
Best Performance
7
4.3
Liqui Moly 3658 Transmission Oil additive

Liqui Moly 3658 Transmission Oil additive

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  • Product 1: For modern manual gear boxes and transaxles - in particular from the Citroën and Peugeot group. Observe vehicle / unit manufacturer's warnings.
  • Product 1: Specifications and approvals: API GL 5, MIL-L 2105 C
  • Product 1: Liqui Moly also recommends this product for vehicles that require the following specifications: PSA B 71 2330
  • Product 1: Semi-synthetic gear oil with extremely high performance reserves. Ensures exact friction behavior and provides outstanding ageing resistance. Has outstanding low-temperature behavior.
  • Product 2: All of the friction surfaces and furniture.
Best Accuracy
8
4.2
XADO MAXIMUM Additive

XADO MAXIMUM Additive

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  • Eliminates blowholes and scratches on the operation surfaces
  • Optimizes contact patters in gear engagement
  • Reduces the level of noise and vibrations of assemblies by 10 times
  • Increases the accuracy of gear shifting
  • Improves the operation of synchronizers
Improves lubrication
9
4.1
ATOMIUM AGSB Additive

ATOMIUM AGSB Additive

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  • - Reduces friction (cold start improvement)
  • - Improves lubrication
  • - Increases the service life
  • - Improves gear shift
Cheapest Option
10
4
XADO Engine Oil Additive

XADO Engine Oil Additive

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  • Set against wear for engine and manual transmission, restores the surfaces and compensates for the resulting wear
  • Engine: restoration of engine compression, renewal of surfaces
  • Forms an active protection against overloading and overheating. Extends service life
  • Transmission: restores the surfaces of the components and compensates for continuous wear
  • Reduces noise and vibration | Extends service life


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