

🛠️ Fix leaks, silence noise, and drive worry-free—because your gears deserve the best!
Bar’s Leaks Axle & Differential Gear Repair is a 16.9 oz treatment additive designed to stop leaks in pinion, axle, and output shaft seals. Compatible with all synthetic and conventional GL-4, GL-5, and MT-1 gear oils, it reduces noise, wear, and corrosion while extending gear system life. Made in the USA, it’s trusted across automotive, heavy-duty, agricultural, marine, and industrial applications.






| ASIN | B0869GRFC7 |
| Best Sellers Rank | #11,421 in Automotive ( See Top 100 in Automotive ) #84 in Oil & Fluid Additives |
| Brand Name | Bar's Leaks |
| Container Type | Bottle |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,096) |
| Included Components | Bar's Leaks Differential Gear Repair |
| Item Form | Liquid |
| Item Type Name | Bar's Leaks Axle and Differential Gear Repair |
| Item Weight | 16.9 Ounces |
| Liquid Volume | 16.9 Fluid Ounces |
| Manufacturer | Bar's Leaks |
| Material | Petroleum |
| Recommended Uses For Product | Fleet and plant maintenance. |
| Specific Uses For Product | Fleet and plant maintenance. |
| UPC | 046087018163 |
| Unit Count | 500 Milliliters |
| Warranty Description | Please see manufacturer |
C**.
Stopped my leak
Noticed a leak while in arizona, wasn’t expecting much if anything. I am surprised because so many “snake oil” products don’t work. My pinion seal was leaking had about 800 miles to home. Put it in and topped off differential when I filled up with fuel. The next fuel up about 350 miles I checked the diff, no leak, checked to be positive I had fluid in it still and was surprised it was 3/4 full still. Topped it off and went on. Checked the next fill and was still full. I’m happy, but still getting seal replaced. It worked in a pinch!
T**N
Worked perfect!!
I had a small leak on a Kawasaki 4x4 ATV. Added about 6oz to the rear diff, and it solved my issue the same day after about a 30 min ride and spray down with brakleen. Zero drips for the last week or so Seems to have worked perfect and performs as advertised. Actually pretty impressed. Was planning on doing a full labor intensive rebuild, but took a chance on this. We will see how long it lasts, but so far so good!
R**N
GREAT PRODUCT!
My girlfriend has an 08 rav4 that had a leaky rear axle seal and viscous coupler. The leaks were both fairly small but within a month the differential would be down to about half full which made me very weary whenever she had to go somewhere. The last thing I would want is to put a rear diff in her car. I typically don't trust these stop leak type of products because in my experience they're usually just snake oil. I read the reviews and figured I had nothing to lose so I tried it out. I must say this stuff is amazing, I added just a little bit over the recommended amount to the rear diff and 2 months later the fluid is still full. I often look under the car to check for drips and there is never a drop. There used to be small drops of gear oil hanging off of the diff about to fall onto the ground but this has completely stopped. You can still see where a very negligible amount of gear oil is leaking down the side of the diff below the seals so I don't think the leaks have stopped 100% but more realistically they've probably stopped about 90-95%. This additive is probably more of a temporary fix because leaking seals usually get worse over time but it's gotten me 2 months without having to pull cv axles and replace the seals so I am very pleased. I cannot speak on the gear repair or ability to stop noisy rear axles that this product claims because I didn't have that issue but it's ability to stop leaks seems to be great. I had very slow leaks and it did well for me but I doubt this stuff would help with more serious leaks. Overall I think this is a great product! Quality: 10/10 Price: 10/10 Leak repair: 9.8/10
D**.
Diff May be too damaged
I have a 2003 Land cruiser that leaks front diff fluid (front axel seal) I bought it and discovered the leak when changing gear fluids. The front diff fluid may not have been ever changed in 205,000 miles. The fill plug differs from the other plugs in that it is a torx. It looks like someone tried to get it out with a hex and failed. Anyway when draining it came our as a gelatinous black goo. The plug has a long tail of metal particles in the goo.. Except for the black goo very littke fluid came out. Anyway I changed the fluid and the leak was obvious and the diff whining as well. I used this product and it seems to have slowed the leak somewhat but the whining is still there. In all fairness I haven't driven the vehicle that much after adding the product. So it may require more miles as inducated in the label. I gave it a 4 because I believe its doing something sliwing the leak and may work better if I drive more miles at a time. I also think the damage to the diff and seal may be too severe to remedy with a chemical.
D**O
Muy bueno
C**S
Okay
Okay but did not stop the leak in my 2005 Tacoma. Maybe if I had put another bottle in would have worked.
J**K
it stopped the pinion bearing from leaking at the driveshaft
my rear pinion bearing was bad and leaking it fixed the leaking unfortunately the bearing had been leaking so long i needed a new one but it reduced the noise of the bad bearing by quit a bit. I was able to get a couple of thousand miles out of the bad bearing before I had it changed. I didnt follow the recommendations I didnt mix this stuff I put all four quarts in and I think i use a little bit of the recommended oil just to fill the diff. It will fix a seal but it aint gonna fix a bad bearing. So its a temp fix if anything. After I had my bearing replaced I filled it up with this stuff.
M**S
OK. Works well
worked well for small leak in seal
H**D
Works well
I**V
I had a very small oil leak from the gearbox, about 4-5 drops per day. First I tried Xado stop gearbox leak - no effect, then I tried Lique molly stop gearbox leak - the leak decreased, but 2-3 drops remained per day. Now I changed the oil with new one and put this Bars additive. After 2 days of driving the leak stopped, there is not a single drop on my garage floor! So this works, and the gearbox shifts better. I am satisfied!
V**V
Hello it's worked.bars gear repair high viscosity oil filled in jeep liberty rear wheel differential housing due to abnormal sound while turning especially. Value for money.
A**R
Yes i liked it & i used it on my 1955 Buick Century.
S**Z
وصل المنتج كما طلبت والتغليف ممتاز والوصول في الوقت المحدد ، وتحت التجربه واثق في هذه الشركه ومتأكد ان منتجاتها ذات فعاليه
Trustpilot
1 month ago
4 days ago