



🛠️ Seal the deal on leaks before they seal your fate!
Bar's Leaks OS-1-4PK is a powerful oil seal and leak repair solution designed for a wide range of engines—from everyday cars to heavy-duty machinery. It renews worn valve seals, stops oil burning and blue smoke, and works across gasoline, diesel, turbocharged, hybrid, and racing engines. Packaged in a convenient 4-pack, this USA-made formula is a must-have for proactive vehicle maintenance and extending engine life.








| ASIN | B0764M5YFP |
| Best Sellers Rank | 428,014 in Automotive ( See Top 100 in Automotive ) 1,254 in Fillers, Adhesives & Sealants |
| Brand | Bar's Leaks |
| Customer Reviews | 4.3 4.3 out of 5 stars (105) |
| Date First Available | 3 Oct. 2017 |
| Item Weight | 2.22 kg |
| Item model number | OS-1-4PK |
| Manufacturer | Bar's Products |
| Manufacturer part number | OS-1-4PK |
| Model | Oil Seal |
| Product Dimensions | 22.86 x 17.78 x 12.7 cm; 2.22 kg |
| Viscosity | 5W-30 sae_grade |
R**S
I use this in my 1966 Ford F-100 that still has the original drivetrain with 139,000 miles on the 352 V8 engine. As with these older vehicles, they used a rope seal for the rear bearing, which always leaked. Bar’s slows down the leak when used regularly during oil changes and when oil level is low. It doesn’t fix the rope seal from leaking, but does slow it down.
C**K
I used a ton of this S* in my Mountaineer before I realized that my F* oil sensor plug was actually leaking. $20 and 15 minute fix. However, I use this stuff in all my older vehicles and any seal leak stops after a week or so. Good S* ! A must for older motors. Good price.
G**Y
Stopped oil burning in my Eco-Tec for awhile. You need to continue use to keep it working. Even helped my riding lawnmower!
A**R
This does the Job
E**I
After trying other products on leaking car I ponied up the extra $$$ for this one and wish I had started with this from the beginning. Love it and highly recommend this.
Trustpilot
2 months ago
2 weeks ago