---
product_id: 10435439
title: "Rear Main Seal Repair (Pack of 6)"
brand: "bar's leaks"
price: "904 kr"
currency: DKK
in_stock: true
reviews_count: 13
category: "Bar's Leaks"
url: https://www.desertcart.dk/products/10435439-rear-main-seal-repair-pack-of-6
store_origin: DK
region: Denmark
---

# Universal fuel compatibility Seals multiple engine leaks Treats up to 6 quarts oil Rear Main Seal Repair (Pack of 6)

**Brand:** bar's leaks
**Price:** 904 kr
**Availability:** ✅ In Stock

## Summary

> 🛠️ Fix leaks like a pro—because your engine deserves the VIP treatment!

## Quick Answers

- **What is this?** Rear Main Seal Repair (Pack of 6) by bar's leaks
- **How much does it cost?** 904 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/10435439-rear-main-seal-repair-pack-of-6)

## 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

- • **Seal Restoration Power:** Revives dried, hardened seals to like-new condition, extending engine life and preventing costly repairs.
- • **Multi-Leak Seal Technology:** Not just rear main seals—also restores timing cover, cam seals, O-rings & gaskets with superior sealing power.
- • **Trusted Longevity Solution:** Proven to reduce leaks for thousands of miles, making it a smart, cost-saving addition to every oil change.
- • **Precision Dosage Efficiency:** One bottle treats 4-6 quarts of oil, perfect for cars, motorcycles, ATVs, and lawn equipment alike.
- • **Universal Engine Compatibility:** Works seamlessly with gasoline, diesel, turbocharged & synthetic oils for every ride in your life.

## Overview

Bar's Leaks Rear Main Seal Repair is a high-performance liquid additive designed to stop oil leaks by restoring and swelling worn rubber seals. Compatible with all petroleum-based oils and engine types, it effectively seals rear main, timing cover, cam seals, and other gasket leaks. Each bottle treats up to 6 quarts of oil, providing a cost-effective, long-lasting solution that keeps your engine leak-free and running smoothly.

## Description

Most rear main seal leaks are caused by a combination of normal wear in the crankshaft & seal and the drying, hardening and shrinking of the main seal. Bar’s Leaks® Rear Main Seal Repair restores the seal to like new condition and also contains additives to stop leaks in severely worn seals and crankshafts. Compatible with all petroleum based engines oils including high-mileage and synthetic. Works with ALL vehicle types including gasoline, diesel and turbocharged. Specifically designed to seal rear main leaks, but also works better than a conventional stop leak on all other leaks. This includes the timing cover seal, cam seals, O-Rings and other gaskets.

Review: Read this if you are considering buying this product for an oil leak! - I'll start by saying this product goes against everything I believe or have been taught about internal combustion engines, the two most prevailing thoughts before ordering this were: #1: Only oil goes in the crankcase, nothing else #2: Snake oil does not work, especially for a long term solution, fix the real problem instead of throwing money and additives at the problem that ultimately may do more harm than good I have a small block ford engine that has a notorious rear main seal leak, drips engine oil right at the transmission bell housing. Started small and got worse. This is a well documented problem, and the transmission must be pulled to replace the seal. I have heard many stories of people who have replaced the seal, only to have the brand new one leak too, people have tried crankshaft sleeves to make the fit tighter, and with mixed results. I did not want to go down this road unless I had no other option. I did a little research on this product, and the reviews are mixed. I have not heard any horror stories worse than "it didn't help and I wasted my money on this product", and from what I understand it works completely differently than the "leak stop" additives you would use for a head gasket, coolant leak, air conditioning system leak, or tire leak. All the latter leak stop additives are adhesive products which are glues and materials designed to fill cracks/voids and cure on contact with air. This product works differently. This product is not an adhesive of any kind and does not leave any residue. It is basically a solvent that attacks rubber and causes it to swell. This makes the seals fit a little tighter if the only problem is a seal is a little old or dried out. If the seal is cracked, deformed, or a synthetic material that the active ingredient in this product doesn't react with (its designed for rubber, not corks, silicones, etc), this product will most likely not help. I dumped this in the oil reservoir. It was already a little low from the leak, so the excess oil in the crankcase was not an issue. Ran the engine for about 30 mins and no change, still same dripping while running. I drove the vehicle every day approx 30 miles. After a week, the leak was barely noticable, just the bottom of the transmission housing felt a little oily, but no puddle/stains in the driveway. After 2-3 weeks, the leak was gone. And I mean gone, not a drop. I was impressed how well this worked on this problem and thought it fixed it permanently. Then about 4000mi later, I did an oil change. For the first few hundred miles after that, no leaks, then after about 1k miles, I noticed the leak started to return. I immediately picked up another bottle of this stuff and dumped it in, about 1 week later, the leak was gone. I now don't even mess around anymore and just add a bottle of this stuff to every oil change, and it is under control, its a small price to pay (even for life of vehicle) to not have to deal with the rear main seal. For me, this product makes a night and day difference, I have been using it for approx 30k miles, but depending on the root cause of your leak, your mileage may vary.
Review: Save me money and my truck - I just wanted to share a quick note about this product I used it about a year ago and since then really saved me a lot of trouble (and money!). My old truck, a trusty 2004 model, had developed quite an oil leak, losing about 1 to 1.5 quarts every single month. I was seriously considering getting rid of it because the thought of paying for expensive mechanic repairs just wasn't worth it for a vehicle of that age. It felt like a losing battle. But then I tried this product, and honestly, it's been a game-changer! It's been a full year since I started using it, and my truck is still running strong. I genuinely don't notice any oil loss anymore, which is fantastic. It does take some time to notices the product stars working but at the end of couple weeks you may start seeing that stars working. I've been adding it every other oil change. I'm not sure if that's overkill, but I'm just so thrilled to still have my truck and avoid those costly repairs. It's fantastic to have it back on the road without constantly worrying about the oil levels. Just wanted to pass along my positive experience!

## Features

- STOPS ALL OIL LEAKS: Works with ALL vehicle types including gasoline, diesel and turbocharged.
- SEALS TIMING COVER, CAM SEAL, REAL MAIN LEAKS: Specifically designed to seal rear main leaks, but also works better than a conventional stop leak on all other leaks. This includes the timing cover seal, cam seals, O-Rings and other gaskets.
- SEAL RESTORER: Bar’s Leaks Rear Main Seal Repair restores the seal to like new condition and also contains additives to stop leaks in severely worn seals and crankshafts.
- SEAL POLYMER: Compatible with all petroleum based engines oils including high-mileage and synthetic.
- DOSAGE: One bottle treats 4 to 6 quarts of oil. Larger systems use 1 bottle for every 5 quarts of oil capacity. For small engines including 4 cycle / stroke motorcycle, ATV, lawn mowers and other engines use approximately 3 to 4 ounces per quart of capacity.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BYS6OD4 |
| Best Sellers Rank | #4,504 in Automotive ( See Top 100 in Automotive ) #16 in Fuel Additives |
| Brand | Bar's Leaks |
| Customer Reviews | 4.2 4.2 out of 5 stars (3,005) |
| Date First Available | March 22, 2013 |
| Global Trade Identification Number | 10046087010409 |
| Item Form | Liquid |
| Item Weight | 6.95 pounds |
| Item model number | 1040-6PK |
| Liquid Volume | 16.9 Fluid Ounces |
| Manufacturer | Bar's Leaks |
| Manufacturer Part Number | 1040-6PK |
| Material | Synthetic |
| Model | 1040-6PK |
| Number of Items | 6 |
| Package Information | Bottle |
| Product Dimensions | 7.6 x 3.4 x 2 inches |
| Recommended Uses For Product | Automotive |
| Specific Uses For Product | Prevent Corrosion |
| Unit Count | 101.4 Fluid Ounces |
| Voltage | 12 Volts |

## Product Details

- **Brand:** Bar's Leaks
- **Liquid Volume:** 16.9 Fluid Ounces
- **Material:** Synthetic
- **Package Information:** Bottle
- **Recommended Uses For Product:** Automotive

## Images

![Rear Main Seal Repair (Pack of 6) - Image 1](https://m.media-amazon.com/images/I/715ymgSJtpL.jpg)

## Questions & Answers

**Q: Is this safe for diesels, specifically the Duramax 6.6L?**
A: Yes..... According to Bars Product, this is compatible with all engines and engine oils.

**Q: Can you use this with synthetic oils**
A: Yes, I have used it with synthetic oil with no issues.

**Q: What it does with my other gasket that has not have a leak?**
A: If I'm understanding your question correctly.... you would like to know what effect this has on gaskets that are not leaking?    The answer is nothing.....  Thank you  Eric

**Q: Is this safe to use with other gas additives such as seafoam, lucas?**
A: Yes there is no problem. This gets poured into your oil crankcase not into your gasoline. Seafoam usually gets poured into your gas tank to clean injectors and cylinder walls sometimes you can put it in the crankcase just about 4 oz to clean junk this does not stop any leaks usually done 100 or 200 mi before an oil change. Lucas has many products some that are injector cleaners that go into the fuel tank some that are oil stabilizers or stop leaks or friction additives that go into your oil crankcase you can have Lucas oil additive/stop leak and bars leak in your oil crankcase they don't interfere with one another

## Customer Reviews

### ⭐⭐⭐⭐⭐ Read this if you are considering buying this product for an oil leak!
*by T***E on April 27, 2014*

I'll start by saying this product goes against everything I believe or have been taught about internal combustion engines, the two most prevailing thoughts before ordering this were: #1: Only oil goes in the crankcase, nothing else #2: Snake oil does not work, especially for a long term solution, fix the real problem instead of throwing money and additives at the problem that ultimately may do more harm than good I have a small block ford engine that has a notorious rear main seal leak, drips engine oil right at the transmission bell housing. Started small and got worse. This is a well documented problem, and the transmission must be pulled to replace the seal. I have heard many stories of people who have replaced the seal, only to have the brand new one leak too, people have tried crankshaft sleeves to make the fit tighter, and with mixed results. I did not want to go down this road unless I had no other option. I did a little research on this product, and the reviews are mixed. I have not heard any horror stories worse than "it didn't help and I wasted my money on this product", and from what I understand it works completely differently than the "leak stop" additives you would use for a head gasket, coolant leak, air conditioning system leak, or tire leak. All the latter leak stop additives are adhesive products which are glues and materials designed to fill cracks/voids and cure on contact with air. This product works differently. This product is not an adhesive of any kind and does not leave any residue. It is basically a solvent that attacks rubber and causes it to swell. This makes the seals fit a little tighter if the only problem is a seal is a little old or dried out. If the seal is cracked, deformed, or a synthetic material that the active ingredient in this product doesn't react with (its designed for rubber, not corks, silicones, etc), this product will most likely not help. I dumped this in the oil reservoir. It was already a little low from the leak, so the excess oil in the crankcase was not an issue. Ran the engine for about 30 mins and no change, still same dripping while running. I drove the vehicle every day approx 30 miles. After a week, the leak was barely noticable, just the bottom of the transmission housing felt a little oily, but no puddle/stains in the driveway. After 2-3 weeks, the leak was gone. And I mean gone, not a drop. I was impressed how well this worked on this problem and thought it fixed it permanently. Then about 4000mi later, I did an oil change. For the first few hundred miles after that, no leaks, then after about 1k miles, I noticed the leak started to return. I immediately picked up another bottle of this stuff and dumped it in, about 1 week later, the leak was gone. I now don't even mess around anymore and just add a bottle of this stuff to every oil change, and it is under control, its a small price to pay (even for life of vehicle) to not have to deal with the rear main seal. For me, this product makes a night and day difference, I have been using it for approx 30k miles, but depending on the root cause of your leak, your mileage may vary.

### ⭐⭐⭐⭐⭐ Save me money and my truck
*by H***A on January 7, 2026*

I just wanted to share a quick note about this product I used it about a year ago and since then really saved me a lot of trouble (and money!). My old truck, a trusty 2004 model, had developed quite an oil leak, losing about 1 to 1.5 quarts every single month. I was seriously considering getting rid of it because the thought of paying for expensive mechanic repairs just wasn't worth it for a vehicle of that age. It felt like a losing battle. But then I tried this product, and honestly, it's been a game-changer! It's been a full year since I started using it, and my truck is still running strong. I genuinely don't notice any oil loss anymore, which is fantastic. It does take some time to notices the product stars working but at the end of couple weeks you may start seeing that stars working. I've been adding it every other oil change. I'm not sure if that's overkill, but I'm just so thrilled to still have my truck and avoid those costly repairs. It's fantastic to have it back on the road without constantly worrying about the oil levels. Just wanted to pass along my positive experience!

### ⭐⭐⭐⭐ Good product, seems to do the job pretty well
*by L***R on November 22, 2025*

Seems to work good, not perfect but definitely slowed down the leak quite a bit. I was getting a lot of drips from the rear main before, but now it's almost stopped, but not completely. I get a few drops here and there is all. Nothing major. So I'd say this project does it's job pretty good.

## Frequently Bought Together

- Bar's Leaks Rear Main Seal Repair (Pack of 6)
- Bar's Leaks High Mileage Engine Repair-It, Pack of 4
- Bar's Leaks OS-1-4PK Seal Engine Oil Burning/Leak Repair - 16.9 oz, (Pack of 4)

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---

*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-01-28*