--- product_id: 278062427 title: "HJ12 Jack Oil with Stop Leak - 12.5oz" brand: "bar's leaks" price: "€ 29.15" currency: EUR in_stock: true reviews_count: 6 category: "Bar's Leaks" url: https://www.desertcart.gr/products/278062427-hj12-jack-oil-with-stop-leak-12-5oz store_origin: GR region: Greece --- # Durable, industry-standard formula SAE J300 viscosity grade 12 12.5oz synthetic oil volume HJ12 Jack Oil with Stop Leak - 12.5oz **Brand:** bar's leaks **Price:** € 29.15 **Availability:** ✅ In Stock ## Summary > 🛠️ Don’t let leaks slow you down—power up your jack with HJ12! ## Quick Answers - **What is this?** HJ12 Jack Oil with Stop Leak - 12.5oz by bar's leaks - **How much does it cost?** € 29.15 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/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 - • **Secure Packaging:** Safe, spill-proof bottle ensures mess-free application every time - • **Rapid Restoration:** Refill and bleed air in under 5 minutes—get back to work fast - • **Compact & Convenient:** 12.5oz bottle fits perfectly in your toolkit for on-the-go maintenance - • **Long-Lasting Protection:** Synthetic oil reduces wear and extends jack lifespan even under extreme conditions - • **Precision-Engineered Formula:** Keeps your hydraulic jack leak-free and fully functional ## Overview HJ12 Jack Oil with Stop Leak is a 12.5oz synthetic hydraulic oil designed to restore and maintain hydraulic jacks by sealing leaks and improving performance. Engineered to SAE J300 viscosity standards, it offers durable, long-lasting protection against wear and corrosion, packaged in a compact, secure bottle for easy, mess-free application. ## 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: Great product - 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. ## 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 | #52,948 in Automotive ( See Top 100 in Automotive ) #639 in Automotive Oils | | Brand | Bar's Leaks | | Brand Name | Bar's Leaks | | Container Type | Bottle | | Customer Reviews | 4.7 out of 5 stars 3,546 Reviews | | Global Trade Identification Number | 00046087000441 | | Item Form | Oil | | Item Weight | 0.79 Pounds | | Item weight | 0.79 Pounds | | Liquid Volume | 12.5 Fluid Ounces | | Liquid volume | 12.5 Fluid Ounces | | Manufacturer | Bar's Leaks | | Material | Synthetic | | Model Number | HJ12 | | Number of Items | 1 | | Package information | Bottle | | Part Number | HJ12 | | Recommended Uses For Product | packaging | | Recommended uses for product | packaging | | SAE J300 Viscosity Grade | 12 | | Specific Uses For Product | [INF] Inferred: Reduce wear, Extend oil drain intervals, Operate in extreme temperatures, Protect against corrosion | | UPC | 046087000441 | | Unit Count | 12.5 Milliliters | ## 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) ![HJ12 Jack Oil with Stop Leak - 12.5oz - Image 2](https://m.media-amazon.com/images/I/614i4u6W6IL.jpg) ![HJ12 Jack Oil with Stop Leak - 12.5oz - Image 3](https://m.media-amazon.com/images/I/41X0xUy+9EL.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 ### ⭐⭐⭐⭐⭐ Great product *by B***R on 30 June 2026* 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. ### ⭐⭐⭐⭐⭐ Saved My Jack and My Wallet! *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. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/278062427-hj12-jack-oil-with-stop-leak-12-5oz](https://www.desertcart.gr/products/278062427-hj12-jack-oil-with-stop-leak-12-5oz) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-08-09*