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20 Best Transmission Stop Leak (2022 Updated)

Transmission stop leak is a product that is added to the transmission fluid in order to seal any leaks that may be present. This can be a temporary fix for a small leak, or it can help to prevent larger leaks from developing.

Stop leak products are not a permanent fix, and they should only be used as a last resort.

20 Best Transmission Stop Leak

Product Image Product Name Features Price

Rislone 4502 Transmission Stop Slip with Leak Repair – 32 oz.

  • Restores performance
  • Quiets noise
  • Stops leaks

Bar's Leaks 1400 Transmission Repair

  • Restores performance
  • Stops slipping and prevents lazy shifts
  • Quiets noise

Liqui Moly 1042 Gearbox Oil Leak Stop – 50 Liter

  • Compact construction
  • Seamless functionality
  • Packed with features

Bars Leaks 1414 CVT Transmission Fix – 11 oz.

  • Extreme Pressure/Anti Wear Agents
  • Seal Conditioner and Cleaning Detergents
  • Performance additive booster

Lucas Transmission Fix – 24 Ounce (Case of 12)

  • Great for eliminating most seal leaks
  • Works in all transmissions
  • Country of Origin: United States

SealLube – Stops Leaks: Gasoline Engines, Diesel Engines, Automatic Transmissions, Manual Transmissions, Power Steering, Rack An

  • RESTORES FLEXIBILITY, ELASTICITY AND TENSILE STRENGTH OF ALL RUBBER SEALS
  • BOTTLE TREATS UP TO 8 QUARTS
  • PROUDLY MADE IN THE USA

AT-205 ATP Re-Seal Leak Stopper 8oz (4-Pack)

  • 4 Pack

Permatex Gasket Maker, Automatic Transmission – 3 oz 81180

  • Specially designed to withstand the harsh detergents and additives found in automatic transmission fluid
  • Formulated to resist aging, weathering and thermal cycling without hardening, shrinking or cracking

K Trans-X Automatic Transmission Slip-Stop & Leak Fix, 15 fl oz,

  • Stops leaks and slips
  • Restores smooth shifting
  • Not VOC Compliant for California & OTC

CRC 402033×6 Trans-X Slip-Stop Leak-Fix – 32 fl oz.

  • Stops leaks and slips
  • Restores smooth shifting
  • Not VOC Compliant for California & OTC

Blue Devil Transmission Sealer 16 Ounce Automotive Accessory Permanent Restoring

  • Permanent Seal
  • Restores Dried, Cracked, and Shrunken Rubber Seals
  • Works in Manual or Automatic Transmissions

Lucas Transmission Fix – 24 fl oz

  • Contains no solvents
  • Lowers operating temperatures and stops foaming
  • Can be added to existing fluid without draining any out

Bar's Leaks Transmission Fix – 11.5 fl oz

  • Seal conditioners stop current leaks and prevent future instances by protecting and reconditioning seals
  • Advanced cleaning detergents include dispersants and antioxidants to remove sludge and varnish from metal parts

Lucas 10009 Transmission Fix 24 oz

  • Contains no solvents
  • Lowers operating temperatures and stops foaming
  • Can be added to existing fluid without draining any out

K&W Trans-X High Mileage Automatic

  • Developed for vehicles with 75,000 miles or more.
  • High tech formula extends transmission life.
  • Stops & prevents leaks.

Permatex 81180 Automatic Transmission RTV Sealant 3 oz Tube

  • Specially designed to withstand the harsh detergents and additives found in automatic transmission fluid
  • Formulated to resist aging, weathering and thermal cycling without hardening, shrinking or cracking

Bars Leaks 1305 16.9 fl oz Super Leak Fix

  • Use for Preventative Maintenance
  • Made in the USA
  • Will Not Clog Filter or Harm System closure

ATP AT-205 Re-Seal Stops Leaks 8 Ounce Bottle

  • Professional strength fast acting resealer, stops leaks fast
  • Rejuivinates all rubber seals & gaskets in engines, transmissions, power steering, differentials and hydraulic systems
Rislone 4502 Transmission Stop Slip with Leak Repair – 32 oz.
  • Restores performance
  • Quiets noise
  • Stops leaks
Bar's Leaks 1400 Transmission Repair
  • Restores performance
  • Stops slipping and prevents lazy shifts
  • Quiets noise
Liqui Moly 1042 Gearbox Oil Leak Stop – 50 Liter
  • Compact construction
  • Seamless functionality
  • Packed with features
Bars Leaks 1414 CVT Transmission Fix – 11 oz.
  • Extreme Pressure/Anti Wear Agents
  • Seal Conditioner and Cleaning Detergents
  • Performance additive booster
Lucas Transmission Fix – 24 Ounce (Case of 12)
  • Great for eliminating most seal leaks
  • Works in all transmissions
  • Country of Origin: United States
SealLube – Stops Leaks: Gasoline Engines, Diesel Engines, Automatic Transmissions, Manual Transmissions, Power Steering, Rack An
  • RESTORES FLEXIBILITY, ELASTICITY AND TENSILE STRENGTH OF ALL RUBBER SEALS
  • BOTTLE TREATS UP TO 8 QUARTS
  • PROUDLY MADE IN THE USA
AT-205 ATP Re-Seal Leak Stopper 8oz (4-Pack)
  • 4 Pack
Permatex Gasket Maker, Automatic Transmission – 3 oz 81180
  • Specially designed to withstand the harsh detergents and additives found in automatic transmission fluid
  • Formulated to resist aging, weathering and thermal cycling without hardening, shrinking or cracking
K Trans-X Automatic Transmission Slip-Stop & Leak Fix, 15 fl oz,
  • Stops leaks and slips
  • Restores smooth shifting
  • Not VOC Compliant for California & OTC
CRC 402033×6 Trans-X Slip-Stop Leak-Fix – 32 fl oz.
  • Stops leaks and slips
  • Restores smooth shifting
  • Not VOC Compliant for California & OTC
Blue Devil Transmission Sealer 16 Ounce Automotive Accessory Permanent Restoring
  • Permanent Seal
  • Restores Dried, Cracked, and Shrunken Rubber Seals
  • Works in Manual or Automatic Transmissions
Lucas Transmission Fix – 24 fl oz
  • Contains no solvents
  • Lowers operating temperatures and stops foaming
  • Can be added to existing fluid without draining any out
Bar's Leaks Transmission Fix – 11.5 fl oz
  • Seal conditioners stop current leaks and prevent future instances by protecting and reconditioning seals
  • Advanced cleaning detergents include dispersants and antioxidants to remove sludge and varnish from metal parts
Lucas 10009 Transmission Fix 24 oz
  • Contains no solvents
  • Lowers operating temperatures and stops foaming
  • Can be added to existing fluid without draining any out
K&W Trans-X High Mileage Automatic
  • Developed for vehicles with 75,000 miles or more.
  • High tech formula extends transmission life.
  • Stops & prevents leaks.
Permatex 81180 Automatic Transmission RTV Sealant 3 oz Tube
  • Specially designed to withstand the harsh detergents and additives found in automatic transmission fluid
  • Formulated to resist aging, weathering and thermal cycling without hardening, shrinking or cracking
Bars Leaks 1305 16.9 fl oz Super Leak Fix
  • Use for Preventative Maintenance
  • Made in the USA
  • Will Not Clog Filter or Harm System closure
ATP AT-205 Re-Seal Stops Leaks 8 Ounce Bottle
  • Professional strength fast acting resealer, stops leaks fast
  • Rejuivinates all rubber seals & gaskets in engines, transmissions, power steering, differentials and hydraulic systems

1. Rislone 4502 Transmission Stop Slip with Leak Repair – 32 oz.

Rislone 4502 Transmission Stop Slip with Leak Repair - 32 oz.

  • Restores performance
  • Quiets noise
  • Stops leaks
  • Stops slipping and prevents lazy shifting
  • Conditions seals and prevents future leaks

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Amazon.com
Walmart
AutoZone
Advance Auto Parts

Product Details

Specifications

Details
Item has MSDS (SDS)? Y
Special Instructions One bottle will treat 12 to 16 qt of transmission fluid. For compact and smaller vehicles, use 1/2 of the bottle. For severe problems or badly worn transmissions, use double the dosage or a second bottle.
Information Effective Date 2011-10-18 12:00:00
Package Weight 2
Package Weight UOM LB

Reviews From Real Customers

ProspectiveAutomotiveLLC
Luke
Ray

2. Bar’s Leaks 1400 Transmission Repair

Bar's Leaks 1400 Transmission Repair

  • Restores performance
  • Stops slipping and prevents lazy shifts
  • Quiets noise
  • Stops leaks
  • Conditions seals and o-rings

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Amazon.com
Walmart
AutoZone
NAPA Auto Parts

Product Details

Specifications

Details
Assembled Depth (in) 1.8 in
Assembled Height (in) 8.4 in
Assembled Width (in) 3.6 in
Assembled Weight (lbs) 1 lbs
Excluded Ship States No

Reviews From Real Customers

Abstract
Ric
oreillyauto.com

3. Liqui Moly 1042 Gearbox Oil Leak Stop – 50 Liter

Liqui Moly 1042 Gearbox Oil Leak Stop - 50 Liter

  • Compact construction
  • Seamless functionality
  • Packed with features

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Amazon.com – Seller
eBay – the_stop_shop_uk

Product Details

Specifications

Details
Product Dimensions 9.04 x 6.07 x 7.64 inches
Is Discontinued By Manufacturer No
OEM Part Number 1042

Reviews From Real Customers

karclan
datavenue
skankyfrankie

4. Bars Leaks 1414 CVT Transmission Fix – 11 oz.

Bars Leaks 1414 CVT Transmission Fix - 11 oz.

  • Extreme Pressure/Anti Wear Agents
  • Seal Conditioner and Cleaning Detergents
  • Performance additive booster

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Amazon.com
eBay
Walmart
AutoZone

Product Details

Specifications

Details
Product Dimensions 3 x 1.8 x 8.12 inches
Country of Origin USA
Is Discontinued By Manufacturer No

Reviews From Real Customers

Jim
Lonnie
Slippingtrany

5. Lucas Transmission Fix – 24 Ounce (Case of 12)

Lucas Transmission Fix - 24 Ounce (Case of 12)

  • Great for eliminating most seal leaks
  • Works in all transmissions
  • Country of Origin: United States
  • Model Number: 10009

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Amazon.com – Seller
eBay

Product Details

Specifications

Details
Product Dimensions 13.75 x 10.38 x 10.38 inches
Country of Origin USA
Is Discontinued By Manufacturer No

Reviews From Real Customers

howardl610
jaramoor0
zbandit63-7

6. SealLube – Stops Leaks: Gasoline Engines, Diesel Engines, Automatic Transmissions, Manual Transmissions, Power Steering, Rack An

SealLube - Stops Leaks: Gasoline Engines, Diesel Engines, Automatic Transmissions, Manual Transmissions, Power Steering, Rack An

  • RESTORES FLEXIBILITY, ELASTICITY AND TENSILE STRENGTH OF ALL RUBBER SEALS
  • BOTTLE TREATS UP TO 8 QUARTS
  • PROUDLY MADE IN THE USA

Check Latest Price

Sold By Price
Amazon.com – Seller
eBay
Sears – Ami Ventures Inc

Product Details

Specifications

Details
Country of Origin USA
Is Discontinued By Manufacturer No

Reviews From Real Customers

aircommuter
mrushd6
don3545

7. AT-205 ATP Re-Seal Leak Stopper 8oz (4-Pack)

AT-205 ATP Re-Seal Leak Stopper 8oz (4-Pack)

  • 4 Pack

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Amazon.com – Seller

Product Details

Specifications

Details
Package Dimensions 8.9 x 6.18 x 3.03 inches
Is Discontinued By Manufacturer No

Reviews From Real Customers

Abo Abid
mBENz jr
Todd Marshall

8. Permatex Gasket Maker, Automatic Transmission – 3 oz 81180

Permatex Gasket Maker, Automatic Transmission - 3 oz 81180

  • Specially designed to withstand the harsh detergents and additives found in automatic transmission fluid
  • Formulated to resist aging, weathering and thermal cycling without hardening, shrinking or cracking
  • Improves transmission oil resistance and provides good adhesion while retaining flexibility
  • Sensor-safe, non-corrosive, non-flammable, non-toxic, and low odor sealant can be used as a gasket maker or dressing
  • Suggested Applications: Automatic transmission pans, case halves and inside covers

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Amazon.com
eBay
Walmart
ECS Tuning

Product Details

Specifications

Details
Units in Package 1
Unit Size 3 oz
Directions Directions: 1. For best results, surfaces should be clean, dry and residue free. 2. Cut nozzle to desired bead size and apply a continuous 1/16 inch to 1/4 inch (2 to 6 mm) bead of silicone to one surface; surrounding all bolt holes. 3. Assemble parts immediately. Finger tighten bolts until material begins to squeeze out around flange. Allow to dry one hour then tighten to torque specifications. 4. Allow 24 hours to fully cure before filling with fluids and returning to service (allow more time to cure in cold or very dry conditions). 5. Replace cap after use. Note: Not recommended for use on head gaskets or parts in contact with gasoline. Store below 80 degrees F (27 degrees C).
Warnings Warning: Cancer – www.P65Warnings.ca.gov. Precautionary Statements – Prevention: Contains: 2-butanone oxime, carbon black, limestone. Obtain special instructions before use. Do not handle until all safety precautions have been read and understood. Avoid breathing dust/fumes/gas/mist/vapors/spray. Use personal protective equipment as required. Wash face, hands and any exposed skin thoroughly after handling. Contaminated work clothing should not be allowed out of the workplace. Wear protective gloves/protective clothing/eye protection/ face protection. Precautionary Statements – Response: If in Eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. If eye irritation persists: Get medical advice/attention. If on Skin: Wash with plenty of soap and water. If skin irritation or rash occurs: Get medical advice/attention. Wash contaminated clothing before reuse. Precautionary Statements – Storage: Store in a well-ventilated place. Keep container tightly closed. Store locked up. Precautionary Statements – Disposal: Dispose of contents/container to an approved waste disposal plant. Warning: On direct contact, uncured sealant irritates eyes and skin. Read carefully other cautions on back panel. Warnings: Causes serious eye irritation; May cause allergic skin reactions; Suspected of causing cancer. Keep out of reach of children.

Reviews From Real Customers

G.
W.B.
Dan L

9. Valvoline VV337 Transmission Fluid with Stop Leak, 32 oz, Size: 1 qt

Valvoline VV337 Transmission Fluid with Stop Leak, 32 oz, Size: 1 qt

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Amazon
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Walmart
Grainger Industrial Supply

Product Details

Specifications

Details
Appearance White
For Use With Multi-Vehicle
Pour Point (F) -51 Degrees F
Application Automatic Transmissions
Flash Point (F) 390

Reviews From Real Customers

Patrick
Mark M
Pete

10. K Trans-X Automatic Transmission Slip-Stop & Leak Fix, 15 fl oz,

K Trans-X Automatic Transmission Slip-Stop & Leak Fix, 15 fl oz,

  • Stops leaks and slips
  • Restores smooth shifting
  • Not VOC Compliant for California & OTC
  • Ideal preventative maintenance tool when added to transmission fluid each time fluid and filter are changed

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Amazon
eBay
NAPA Auto Parts
Advance Auto Parts

Product Details

Specifications

Details
Item has MSDS (SDS)? Y
Oil Composition Conventional
Purpose Extend Transmission Life
Package Size 15 oz
Container Type Plastic Bottle

Reviews From Real Customers

Robert M

11. CRC 402033×6 Trans-X Slip-Stop Leak-Fix – 32 fl oz.

CRC 402033x6 Trans-X Slip-Stop Leak-Fix - 32 fl oz.

  • Stops leaks and slips
  • Restores smooth shifting
  • Not VOC Compliant for California & OTC
  • Ideal preventative maintenance tool when added to transmission fluid each time fluid and filter are changed

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eBay
Walmart
AutoZone

Product Details

Specifications

Details
Item has MSDS (SDS)? Y
Item is Shipped at this Packaging Level N
Net Packaged Quantity 1 EA
Package Size 32 oz
Container Type Plastic Bottle

Reviews From Real Customers

BR625
Anton
Bruin92

12. Blue Devil Transmission Sealer 16 Ounce Automotive Accessory Permanent Restoring

Blue Devil Transmission Sealer 16 Ounce Automotive Accessory Permanent Restoring

  • Permanent Seal
  • Restores Dried, Cracked, and Shrunken Rubber Seals
  • Works in Manual or Automatic Transmissions

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Amazon
eBay
Walmart
AutoZone

Product Details

Specifications

Details
Item has MSDS (SDS)? Y
Packaging Depth 2.75 IN
Packaging Height 7.25 IN
Packaging Width 2.75 IN
Package Weight 1

Reviews From Real Customers

Blue Criminals
Henry
phiwat_5

13. Lucas Transmission Fix – 24 fl oz

Lucas Transmission Fix - 24 fl oz

  • Contains no solvents
  • Lowers operating temperatures and stops foaming
  • Can be added to existing fluid without draining any out

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Target

Product Details

Specifications

Details
Units in Package 1
Unit Size 24 fl oz
Directions A Perfect Preventative Maintenance Product: For extended transmission life and heat control, add one bottle of Lucas Transmission Fix with each fluid change (approximately 30,000 miles; please refer to owner’s manual). Renews Worn Transmission Fluid: Add to existing transmission fluid with engine warm and idling or with fluid change. A second bottle may be necessary in larger or badly worn transmissions. Smaller transmissions (compact or sub-compact vehicles) use 12 oz.
Warnings Keep out of reach of children.

Reviews From Real Customers

Eddie The 2001 Honda Accord Driver
elpistole

14. Bar’s Leaks Transmission Fix – 11.5 fl oz

Bar's Leaks Transmission Fix - 11.5 fl oz

  • Seal conditioners stop current leaks and prevent future instances by protecting and reconditioning seals
  • Advanced cleaning detergents include dispersants and antioxidants to remove sludge and varnish from metal parts

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Sold By Price
Amazon
eBay – firstdeg-71
Walmart

Product Details

Reviews From Real Customers

Aaron
CrazyDD
Last covenant.

15. Lucas 10009 Transmission Fix 24 oz

Lucas 10009 Transmission Fix 24 oz

  • Contains no solvents
  • Lowers operating temperatures and stops foaming
  • Can be added to existing fluid without draining any out
  • Size : 24 Ounce

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Amazon
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Walmart – Advance Cycle Parts
Auto Barn

Product Details

Specifications

Details
Weight 2 oz

Reviews From Real Customers

maesymor
ontheflag18
jonben8

16. K&W Trans-X High Mileage Automatic

K&W Trans-X High Mileage Automatic

  • Developed for vehicles with 75,000 miles or more.
  • High tech formula extends transmission life.
  • Stops & prevents leaks.
  • Restores smooth shifting.
  • Not compatible with CVT transmission fluids.

Check Latest Price

Sold By Price
Amazon
eBay
Walmart
NAPA Auto Parts

Product Details

Specifications

Details
Item has MSDS (SDS)? Y
Packaging Depth 2.81 IN
Packaging Height 7.63 IN
Packaging Width 2.81 IN
Package Weight 1.2

Reviews From Real Customers

bnreggie
Garrett
De

17. Permatex 81180 Automatic Transmission RTV Sealant 3 oz Tube

Permatex 81180 Automatic Transmission RTV Sealant 3 oz Tube

  • Specially designed to withstand the harsh detergents and additives found in automatic transmission fluid
  • Formulated to resist aging, weathering and thermal cycling without hardening, shrinking or cracking
  • Improves transmission oil resistance and provides good adhesion while retaining flexibility
  • Sensor-safe, non-corrosive, non-flammable, non-toxic, and low odor sealant can be used as a gasket maker or dressing
  • Suggested Applications: Automatic transmission pans, case halves and inside covers

Check Latest Price

Sold By Price
Amazon
eBay
Walmart – JB Tool Sales
Advance Auto Parts

Product Details

Specifications

Details
Dimensions 8.9×3.9×1.7

Reviews From Real Customers

merino44
Pedro

18. Bars Leaks 1305 16.9 fl oz Super Leak Fix

Bars Leaks 1305 16.9 fl oz Super Leak Fix

  • Use for Preventative Maintenance
  • Made in the USA
  • Will Not Clog Filter or Harm System closure
  • Seals & Stops all Leaks
  • Works on ALL Engine Oil, Transmission, Power Steering, Hydraulic & Differential & Gear

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Advance Auto Parts

Product Details

Specifications

Details
Container Size 16.9 fl oz (US)
Environmentally Safe Yes
Physical State Liquid
Solubility In Water No
SDS Required Yes

Reviews From Real Customers

JohnRP
chicagoman727
William B.

19. ATP AT-205 Re-Seal Stops Leaks 8 Ounce Bottle

ATP AT-205 Re-Seal Stops Leaks 8 Ounce Bottle

  • Professional strength fast acting resealer, stops leaks fast
  • Rejuivinates all rubber seals & gaskets in engines, transmissions, power steering, differentials and hydraulic systems
  • Compatible with conventional and synthetic oils, ATF, gear oil, power steering fluids and hydraulic oil
  • Does not contain petroleum distillates, will not over-swell or breakdown seals
  • 8oz bottle will treat a 6 quart capacity, adjust accordingly

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eBay
MSM

Product Details

Reviews From Real Customers

ANTHONY
migKab
Tim

20. Wynn’s 64559 325ml Automatic Transmission and Power Steering Stop Leak

Wynn's 64559 325ml Automatic Transmission and Power Steering Stop Leak

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Bonanza – roxy media’s booth

Product Details

Specifications

Details
Product Genre/Category Auto

Reviews From Real Customers

Vectra Owner
Simon the spy man
Adassa32

Conclusion

Transmission stop leak is a product that is used to help seal leaks in the transmission. This product is designed to help keep the transmission fluid in the system and to help prevent leaks. The product is not designed to fix major transmission problems, but it can help to prevent small leaks from becoming a big problem.

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