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Bar's Products OS-1-4PK Oil Seal is a powerful engine oil burning and leak repair solution designed for a wide range of gasoline and diesel engines, including turbocharged, EcoBoost, hybrid, and racing models. It effectively renews worn valve seals and guides, stops oil consumption up to one quart per day, and eliminates blue exhaust smoke. Compatible with 3 to 10 cylinder engines across cars, trucks, SUVs, motorcycles, boats, and heavy-duty vehicles, this USA-made formula ensures comprehensive leak sealing and engine protection.








| ASIN | B0764H6K45 |
| Best Sellers Rank | 8,924 in Automotive ( See Top 100 in Automotive ) 173 in Car Engine Oils |
| Brand Name | Bar's Leaks |
| Compatible with Vehicle Type | Motorcycle |
| Container Type | Bottle |
| Country Of Origin | USA |
| Customer Reviews | 4.1 4.1 out of 5 stars (3,543) |
| Global Trade Identification Number | 00046087010358 |
| Included Components | 16.9 oz Oil Seal |
| Item Type Name | Oil Seal (Engine Oil Burning/Leak Repair) |
| Item Weight | 1.1 Pounds |
| Liquid Volume | 16.9 Fluid Ounces |
| Manufacturer | Bar's Products |
| Manufacturer Part Number | OS-1 |
| UPC | 046087010358 |
| Unit Count | 16.9 millilitre |
| Viscosity | 15W 40 |
A**C
Bar's Oil
Great product. Those what it says on the bottle
A**D
Don't be sceptical!
I put the SO-1 into my engine and turned on the engine sat there for 20mins then drove for 20miles got home and checked my dip stick still where it was when I started my drive, now a few days before I had changed my oil, the next day I replaced my front brake pads I noticed my lower wishbone was very shiny it was soaked in oil, now it isn't, so SO-1 must have worked caramba! Happy me, and no I did not think it would work and now think £22.00 was money well spent, well done Bars Leaks!
M**S
It's expensive and I don't know how long it lasts
Takes a while to work but otherwise good
M**E
Not impressed
Didn’t stop any mina leaks
K**E
Easy to use, very good product. It works.
Does the job if you have a leak always go to a garage but this product may just tie you over. I'm no mechanic but I tried this on my own vehicle and it worked is all I can say. Leaking stopped on my vehicle when used correctly I was very happy.
C**E
Not number one
Would. Or recommend or use has not worked would even say it made my oil leak more
S**E
Works well
Good quick delivery,works well.
D**D
Thanks
Great
A**H
I've bought a lot of products before but they didnt totally stop the leakage as what this product did.
F**.
After not driving the truck for two week, I noticed some little blue smoke came out of my 2006 tacoma when I started it. Searched web and this product was mentioned. I put one bottle into the engine when doing the oil change and never saw the blue smoke again. Can't be easier than that and it does what it says to do.
J**G
Magnífico. Tengo una de mis motos con casi ya 40 años y algunas fugas de aceite motor severas. No era una gotita, era ya casi pequeños charcos. Decidí probar este mejunje y el resultado es de 10. Han desaparecido por completo. No hay fugas ni gotas ni nada de aceite ya bajo la moto. Cuesta creer en estos productos milagrosos, de hecho no creía en ninguno pero como tenía mucha pereza y poca pasta para levantar el motot y gastar más de 200€ en juntas decidí probar por las reseñas positivas que leí a ver que tal en mi moto y si! Funciona 🙂 Apto para motores con embrague en baño de aceite o sea que lo puedes poner en tu moto sin problema... 😜
A**I
Works
J**.
Resultados muy buenos, lo recomiendo
Trustpilot
2 weeks ago
1 month ago