---
product_id: 278062427
title: "HJ12 Jack Oil with Stop Leak - 12.5oz"
brand: "bar's leaks"
price: "€ 33.79"
currency: EUR
in_stock: true
reviews_count: 6
category: "Bar's Leaks"
url: https://www.desertcart.sk/products/278062427-hj12-jack-oil-with-stop-leak-12-5oz
store_origin: SK
region: Slovakia
---

# Secure, leak-proof packaging Industry-grade durability 12.5oz precision volume HJ12 Jack Oil with Stop Leak - 12.5oz

**Brand:** bar's leaks
**Price:** € 33.79
**Availability:** ✅ In Stock

## Summary

> 🛠️ Keep your hydraulic jack leak-free and ready to lift—because downtime is not an option!

## Quick Answers

- **What is this?** HJ12 Jack Oil with Stop Leak - 12.5oz by bar's leaks
- **How much does it cost?** € 33.79 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/278062427-hj12-jack-oil-with-stop-leak-12-5oz)

## Best For

- bar's leaks enthusiasts

## Why This Product

- Trusted bar's leaks brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision 12.5oz Volume:** Optimized size for targeted jack maintenance without waste
- • **Leak-Resistant Packaging:** Ensures safe storage and mess-free application every time
- • **Trusted by Professionals:** Proven performance in 10-ton press hydraulic pumps with zero viscosity issues
- • **Compact & Portable Design:** Easily fits in your toolkit or glove compartment for on-the-go fixes
- • **Industry-Standard Durability:** Crafted with premium materials to withstand heavy-duty hydraulic pressure

## Overview

HJ12 Jack Oil with Stop Leak is a 12.5oz high-quality hydraulic oil designed to maintain and protect hydraulic jacks. Engineered to industry standards, it offers durable performance with leak-resistant packaging, making it a reliable choice for professionals managing heavy-duty equipment.

## Description

Designed as per the prevailing industry standards, it scores high on the aspect of utility. The quality material used in its construction makes it durable.

Review: Not fix the problem - Not fixing the jack problem still not working
Review: Refilled a hydraulic pump and there were no issues. No new leaks or viscosity issues. Thickness and smell and use in a 10-ton press is going just as expected - no problems.

## Features

- Designed to perfection
- Compact construction
- Easy to maintain
- It comes in a safe and secure packaging

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002KKIBY |
| Best Sellers Rank | #45,456 in Automotive ( See Top 100 in Automotive ) #552 in Automotive Oils |
| Item model number | HJ12 |
| Product Dimensions | 16.76 x 9.14 x 8.64 cm; 358.34 g |

## Product Details

- **Brand:** Bar's Leaks
- **Item weight:** 0.79 Pounds
- **Liquid volume:** 12.5 Fluid Ounces
- **Material:** Synthetic
- **Package information:** Bottle

## Images

![HJ12 Jack Oil with Stop Leak - 12.5oz - Image 1](https://m.media-amazon.com/images/I/61ZLB89AjpL.jpg)

## Questions & Answers

**Q: I don't have any leaks on my 3 tons Pittsburg car jack.  Can I still use/fill this oil as a hydraulic oil?**
A: Yes you can it’s just a thicker viscosity to help prevent a leak. Any hydraulic oil can be used also.

**Q: What is the ISO viscosity grade?**
A: This product is around a 5w oil in viscosity. The ISO standards for the viscosity of this product are located on our SDS sheet. I am providing the link below. https://barsleaks.com/wp-content/uploads/2019/07/HJ12-SDS-1.pdf

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.

**Q: Is this an addative to regular oil or do you fill your entire jack with?**
A: Bar’s Leaks Jack Oil with Stop Leak is engineered to stop seal and o-ring leaks caused by normal jack wear and age. If you regularly have to add oil to your jack (and snow plow hydraulics), you’re probably dealing with a leak. This formula renews old jacks and light hydraulics and prevents leaks and seepage on new jacks and hydraulics. Not to mention, it mixes with all approved hydraulic jack oils as well as snow plow fluids, and works in all floor and bottle jacks. It’s 100% safe: non-corrosive, non-clogging and non-foaming.

DIRECTIONS

Clean area around filler cap. Fill jack to proper level. Do not overfill. Cycle jack by lifting and releasing a few times to release any air caught in system. Leaks usually stop in a few days of normal use. If leak continues, repair may be required.

When using the HJ12 (Hydraulic Jack Oil with Stop Leak) top off fluid level as needed. For larger systems use one bottle for every 2 quarts of oil capacity. Do not fill entire jack with HJ12 Fluid. 

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.

**Q: Can I  use at outboard tilt engines**
A: We would need a bit more information on the operation of the system and where you would be adding the fluid. If adding to a closed loop hydraulic pump that lifts and lowers the motor then yes you can use this product. Please contact our Technical Service Professionals at 800-345-6572 or if you would prefer you can use the contact us page on our website. https://barsleaks.com/contact-us/

## Customer Reviews

### ⭐ Not fix the problem
*by A***R on 20 January 2024*

Not fixing the jack problem still not working

### ⭐⭐⭐⭐⭐ Review
*by M***E on 13 November 2025*

Refilled a hydraulic pump and there were no issues. No new leaks or viscosity issues. Thickness and smell and use in a 10-ton press is going just as expected - no problems.

### ⭐⭐⭐⭐⭐ Review
*by A***R on 29 October 2025*

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.

## Frequently Bought Together

- Bar's Leaks Jack Oil with Stop Leak - 12.5 oz
- 16PCS Floor Jack Repair Sealing Tool Kit,3 Ton Floor Jack O Ring Kit with Oil Filler Plug for Improved Sealing of Hydraulic Systems,Standard Car Accessories Floorr Jack Parts
- Johnsen's 5594 Hydraulic Jack Oil - 32 oz.

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-02-24*