I’m needing a stop leak for a manual Subaru Impreza, will this work?

Hi, Jennifer. Thank you for your question, and for considering Bar's Leaks to help with a transmission leak in your Subaru Impreza. We appreciate the opportunity to help you. The product you are asking about - Bar's Leaks Automatic Transmission Repair (part number 1400) was designed for use in automatic transmissions, so we would not recommend you use it in your Impreza. For a vehicle with a manual transmission, we recommend our Bar's Leaks Transmission Stop Leak Concentrate (part number 1420). This product was designed to work with all domestic and import vehicles, with either automatic or manual transmissions. For a manual transmission, you would use approximately 2 ounces of stop leak per 1 quart of transmission fluid capacity. Leaks usually stop in 200 miles or 3 days of driving, but if the leak continues, a second application or mechanical attention may be needed. If we can be of any further assistance, please feel free to call our Technical Support Team at 1-800-345-6572. We are available to help you Monday through Friday, from 8 am to 5 pm, EST.

would this help the whine with a slight slip?

Yes, this product will help with those issues. This formula reduces rough shifting and friction, while eliminating slip, controlling temperature, and repairing shudder, chatter and whining. And how exactly does it do this? It reduces friction enough to prevent wear. It also helps control the temperature, while at the same time allowing some friction to prevent the internal clutch material from slipping. Hundreds of thousands of bottles sold nationally. One bottle of Bar’s Leaks Transmission Repair, 16.9 oz. part number 1400, treats 8 to 12 quarts of transmission fluid. On smaller systems from 4 to 7.9 quarts, only use half bottle, pouring equal amounts from each side. For larger systems use one bottle for every 10 quarts of capacity. If you have any other technical questions, feel free to contact our Technical Service Professionals at 800-345-6572 or if you would prefer you can use the contact us page on our website.

Dose this work with Type F transmission fluid?

Yes, Bar’s Leaks Transmission Repair is formulated to work in all types of transmission fluid. Use in regular automatic transmissions. Do not use in CVT transmissions. If you have any other technical questions, feel free to contact our Technical Service Professionals at 800-345-6572 or if you would prefer you can use the contact us page on our website.

can i use in transmission without any problem?

Thank you for your question, and for considering Bar's Leaks Automatic Transmission Repair to help with your automotive needs. This product can be used in most vehicles with an automatic transmission. It is not recommended for use in vehicles with a CVT, or Continuously Variable Transmission. When used, it will help reduce rough shifting and friction, while eliminating slip, controlling temperature, and repairing chatter, shudder, and whining. You can use it to top off when your transmission fluid is low, or add a bottle when you are changing the fluid. Depending on the transmission issue your vehicle is experiencing, you will normally see results within two (2) days or 100 miles of driving. If you have any other questions, or need additional information, please feel free to contact our Technical Support team at 1-800-345-6572. We are available to assist you Monday through Friday, from 8 am to 5 pm, EST.

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Reviews

K**R

This stuff works praise the Lord

Really helped trans in pt cruisor shifting better was like in a bind now is free good stuff

3.03.2026

R**L

Helped my Chevy truck greatly.

pUT THIS IN MY 1999 Chevy Silerado. Was startingto develop a hard shift from 1st to 2nd. Put it in really didn't feel much of a difference. But after 2 or 3 days of driving. roughly around 60 to 70 miles. Truck is shifting some much better now. WOuld buy it again.

29.11.2025

C**N

Pleased customer.

1963. Thunderbird was slow going into Rever and low. Adjusted the band and it didn’t help.Changed the oil and put in this additive and after about a month,it shifts into low and reverse fine.

25.01.2026

S**S

Should have bought 2

Recommend buying 2.

25.08.2025

K**W

Pleasant Surprise

It has only been about a month but my transmission leak apparently has stopped and I was able to safely travel for the Holidays.

12.01.2026

C**Y

Didnt work but was in pretty bad shape

Tried it as a hail marry on a bad transmission but was too bad to be able to help

16.02.2026

G**A

Bien

21.01.2026

R**O

*5/5 estrellas - ¡El salvador de mi transmisión!* Estoy muy satisfecho con el pomo de aditivo para la transmisión que compré en esta tienda. Mi transmisión estaba empezando a dar problemas, pero después de usar este aditivo, ha vuelto a funcionar como nueva. La calidad del producto es excelente y el precio es muy razonable.Si estás experimentando problemas con tu transmisión, te recomiendo probar este aditivo al 100%. Es una solución efectiva y económica que te ahorrará dinero y dolores de cabeza. ¡No te arrepentirás!

1.12.2025

S**G

The Dynaflow transmission in my 1953 Buick has been sub par for a while, including a leak. The first time I used Barr's transmission treatment the improvement was staggering. No slippage and close to perfect shifting. A little early to tell if leakage has been reduced but I will report later. I have another bottle ready to re-treat as needed and will reorder to have some on hand. At this stage I am no longer considering having the transmission rebuilt, saving a few thousand dollars!

7.07.2024

Z**A

Very good my engine feels like new

27.06.2023

S**M

Wow! I was doubtful when I ordered that this could fix my transmission. I have a clear leak and it causes a heavy gear shift. Within a day of adding to my running vehicle with a funnel through the tranny dipstick slot, the heavy shifts were gone. I have no evidence the leak is still there nor corrected yet, but felt a difference despite me expecting nothing.

23.11.2019

Y**N

I didn't notice any difference despite changing the transmission fluid and the filter. My car is w221 mercedes s class.

29.12.2023

M**N

good

19.02.2026

ASIN	B00092PXIS
Best Sellers Rank	#14,322 in Automotive ( See Top 100 in Automotive ) #11 in Fuel Leak Detectors
Brand	Bar's Leaks
Customer Reviews	4.4 4.4 out of 5 stars (1,273)
Date First Available	July 7, 2004
Global Trade Identification Number	00046087014004
Item Form	Liquid
Item Weight	1.08 pounds
Item model number	1400
Liquid Volume	16.9 Fluid Ounces
Manufacturer	Bar's Leaks
Manufacturer Part Number	1400
Model	Transmission Repair
Number of Items	1
Package Information	Bottle
Product Dimensions	8.4 x 3.6 x 1.8 inches
Recommended Uses For Product	Fleet and plant maintenance.
Specific Uses For Product	Fleet and plant maintenance.
UPC	046087014004
Unit Count	16.9 Ounce

High Mileage Transmission Repair-It, 16.9 Fl Oz

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