Bar's Leaks Jack Oil with Stop Leak - 12.5 oz

Bar's Leaks Jack Oil with Stop Leak is one of those products that's inexpensive enough to try before jumping into a more expensive repair for a minor hydraulic jack leak. The bottle is clearly labeled with straightforward directions, and the built-in nozzle makes it easy to add the fluid without creating much of a mess. The oil has the proper consistency for hydraulic jacks and helps replenish fluid while conditioning seals that may have dried out over time. It's important to have realistic expectations this isn't a permanent fix for severely damaged seals or major leaks but it can be an effective solution for slow leaks and routine maintenance. I also appreciate that it combines hydraulic jack oil with a stop-leak additive, so there's no need to purchase multiple products. The 12.5-ounce bottle provides enough product for servicing most standard floor jacks and bottle jacks, with some left over for future maintenance. Overall, this is a quality maintenance product that is easy to use, reasonably priced, and worth keeping in the garage. If your hydraulic jack has developed a minor leak or simply needs fresh fluid, this is a practical first step before considering more extensive repairs.

My Harbor Freight aluminum floor jack has slowly leaked for many years. Recently, it became more difficult to get the jack fully extended. I started looking for a seal kit (NLA) and stumbled upon a video on refilling the hydraulic fluid. This product was recommended. It took less than 5 minutes to fill the lost fluid and bleed the air. My jack is now fully functional.

Works great!

I wish this had a smaller nozzle. My jack has an extremely small filler port for some reason, and I didn't have a funnel small enough either. I was hoping this would come with a nozzle where I could cut off the tip to my desired size, but it just has a cap with something like a 1/4 inch hole. I could cut the cap, but it would still be about 1/4 inch. Oil everywhere! Not much I could do in the moment (and because I was impatient + didn't want to buy a new funnel). Obviously not the fault of the bottle, but for convenience they could have allowed us to cut the nozzle to the size needed rather than imposing a cap. Either that or something tiny like those 3-in-1 oil bottles you can get so that small filler ports are accommodated. Otherwise, oil seems... oily... does the trick. Jack works. Can't speak to all the benefits it claims to have but the Jack works.

This is great value for the money.

The clutch master cylinder failed on my 2012 Ford Focus. It leaked internally, causing the pedal to sink to the floor without disengaging the clutch, but with no loss of brake fluid. The same reservoir is used on the Focus to hold fluid for the brakes and the clutch. Bars Leaks jack oil with stop leak must NOT be put into the brake system reservoir because it can affect the boiling point of brake fluid and the viscosity thereby causing problems with the ABS system. Also, it will not mix with brake fluid. My solution was to segregate the clutch hydraulics from the brake system. I purchased from Amazon a Lefossi universal reservoir for motorcycle brake systems. I mounted this reservoir on the side of the battery box. I also bought from Amazon some 150 cc plastic syringes for fluid transfer. I cut the fluid line from the brake master cylinder reservoir to the clutch master cylinder fluid intake nipple. I plugged the output nipple on the brake master cylinder reservoir. I ran a hose from the remaining section of the fluid supply line to the clutch master cylinder up to the Lefossi reservoir. I then vacuumed out the remaining residual brake fluid in the clutch system using a manual brake vacuum pump which can be purchased from Amazon, by connecting the vacuum pump to the clutch bleed nipple. After that, I used the syringe to pump the Bars Leak jack fluid into the clutch bleed nipple. This filled the clutch hydraulic system and automatically bled the system of all air. I pumped in just enough jack fluid to fill the Lefossi reservoir (this is called reverse injection). Then I closed the clutch bleed nipple. The result, it took about 15 hours or so for the Bars Leak jack oil to do its magic and then the clutch worked perfectly! Bars company claims you should allow up to 3 days for the oil to recondition the seals of a hydraulic jack or snow plow system. They also insist that there are no solvents in the product which can ultimately dissolve the seals. Bars company does not specifically recommend the jack oil for use in clutch systems, and they caution against putting this stuff into the brake fluid in the brake reservoir. It can ruin your brakes, but I got great results with my clutch system after I segregated the brake hydraulics from the clutch hydraulics, and I saved almost $500!

So far it's working

Product work amazingly well was able to fix both my jacks and still have plenty leftover. One of my jacks were completely out so it took quite a bit but still have enough to feel at least one more and a half jacks. Just have to cover a tip with your finger with you’re about to pour it so it doesn’t spill everywhere.

Not fixing the jack problem still not working

Absolutely incredible product! My floor jack had been slowly leaking down for months and I was ready to toss it and buy a new one. Then I found Bar's Leaks Jack Oil with Stop Leak, and what a difference it made. After topping off the fluid, the jack lifted smoothly again and held pressure like it was brand new. You can see the improvement right away. No more creeping down and no more puddles under the cylinder. The stop leak actually works, and the hydraulic action feels solid and responsive. For such a small bottle, it’s pure magic in a can. I honestly didn’t expect much for the price, but this product exceeded every expectation. It’s easy to pour, works fast, and saves you from having to rebuild or replace your jack. I’ll be keeping a bottle of this in the garage from now on. If your jack is leaking or losing lift, don’t waste time. Get this! It’s the best fix I’ve ever used for a hydraulic issue.

Our 20 year old jack stopped working. While perusing ads for a new one, he thought "hmm, hydraulic fluid is way cheaper"...the fluid worked perfectly and our hydraulic jack is now working as good as new.

All good😁

Works as it should