Oil Seal Engine Oil Burning & Leak Repair (OS-1)

Oil Seal Engine Oil Burning & Leak Repair


  28 Reviews

As a car ages, engine seals harden and shrink from the plasticizers being removed over time. This means leaks, and nobody has time for that. This professional strength synthetic stop leak revitalizes these worn seals and gaskets to restore them to like-new performance. This is our strongest formula ever to stop main seal, valve seals, timing cover seal, cam seals, crankshaft seal, oil pan, valve cover and all other oil leaks.


  1. Turn engine off.
  2. Shake well. Remove oil fill cap and pour Oil Seal™ Engine Oil Burning & Leak Repair into engine per dosage chart.
  3. Do not overfill.
  4. Reinstall cap.
  5. Drive/idle engine for at least 15 minutes to mix thoroughly with oil and activate product to start working.
  6. Top off engine oil (add oil as needed) and leave Bar’s Leaks Oil Seal Engine Oil Burning & Leak Repair in system for continued protection. Drive vehicle as normal. Most oil leak issues are corrected in 250 miles or 3 days of driving.

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This product is incredibly effective against oil leaks, but what about oil burning? We have that covered too. There could be two possible reasons as to why your vehicle is burning engine oil. It may have an oil leak or you it could be burning oil during the ignition cycle. One common problem is if the cylinder walls are allowing oil to leak up from the bottom of the engine, past the piston and into the combustion chamber. So when the fuel ignites the oil does as well, and then expels it out as exhaust. Before you know it, you’re dealing with an oil burning problem.

The good news is that with a single application of Bar’s Leaks Oil Seal, those problems will be history.

Your vehicle is a good candidate for this solution if it does not consume more than one quart of oil per day. We have designed this product to work in all gasoline and diesel engines including turbocharged, EcoBoost, hybrid and even racing engines. This covers 3, 4, 5, 6, 8 and 10 cylinder engines in all cars, trucks, vans and SUV’s. Our product can also be used in heavy-duty applications referencing the appropriate dosage level. This applies to a wide range of other motor applications too: tractors, boats, RV’s, motorcycles (including wet clutch), ATV’s, lawn equipment.

You have a life. Your life needs a car. Don’t let oil leaks or burning get in your way.

Customer Reviews

  28 Reviews
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 28 reviews
 by Frank B.
It's my go-to product

Absolutely the product I depend on. 350k miles and running strong!

 by Jose
Great product

2011 Buick Enclave has been acting up and very valve noisy regardless of gas octane. I did an oil change with your Oil Seal and when I started you can hear the tic tic tic noise and in less than minute it was gone!

 by Gary
Barslesks Oil Seal Additive

Added to my 1999 Hyundai 2.4L engine during oil change. So far so good. Oil smoke from exhaust stopped after about 75 miles of driving. Strongly recommend this product.

 by Jackie W.
Thanks to Bar's Leaks

I purchased Oil Seal and was best thing I could have done. I was burning oil like crazy and was leaking somewhere, I just couldn't find it. After using Oil Seal, it stopped. I haven't had any more issues. I was having to add one or two quarts of oil every week. Thanks to Bar's Leaks it's been fine since.

 by Carlo Q.
Item works effectively

Have a 2001 BMW E38 740il with the MU42TUB44 engine - 142,468 miles at last oil change 2 days ago. I put this in to primarily protect and restore the valves and seals - quiets everything down immediately and noticeably - Vanos timing chain guide failure my biggest worry - understand the perceived inevitability of it - but timing chain rattle nonexistent on start up right through to any tapping or ticking noises reduced from subdued to very quiet.

No engine issues other than very, very minor oil leakage, have original Vanos guides and timing chains, drive conservatively - works beautifully with Castrol Synthetic A3-B4 5W-30 Euro Formula Oil. Bar's Leaks Oil Seal is a compatible synthetic-based formula. No commercial message intended - just a pass along to fellow BMW MU42TUB44 engine owners with minor small issues for preventative maintenance. Really happy with the product.

 by Andrew V.
Worked well

I was losing oil from the engine. I had heard about this product and thought to try it, and it worked well.

 by Dan L.
Use with every other oil change

Oil Seal OS-1 is the product I used. 

The engine is an old Chevy 350, 182,400 miles. It’s going to be leaking oil and it did. After 2 applications your oil seal sure did the trick. I think of it as part of this old truck’s maintenance schedule. I’ll be adding a bottle every other oil change. It works!

 by Frank B.
Fixed leaking valve seals

Oil Seal OS-1 fixed my valve seals on my 4.0L OHV Ranger for 3 months until I had the warner weather to repair properly with hard parts.

 by Amit C.
Very happy, saved me from expensive repair

I used Bar's Leak - Oil Seal Engine Oil Burning & Leak Repair (OS-1).

I have 2002 Toyota Corolla LE and it was leaking oil from engine too much. Due to that, I had to constantly add engine oil. Also, I was getting a burning smell. After using Bar's Leak - Oil Seal Engine Oil Burning & Leak Repair (OS-1), the leak has completely stopped. I don't get any burning smell and I don't have to add oil anymore. I was very happy as it saved me from expensive repair.

 by Brandon B.
Amazing product, great customer service

My wife's 2005 Camry was losing oil somewhere.  There are tons of other products on the market but my research returned me to Bar's Leaks.  The main cause of concern was for the VVT engine in the Camry and, from my research, the (OS-1) Oil Seal was designed with this in mind.  I'm not going to lie. At first, I was very skeptical but after the first couple of days I was very impressed!  I was even more impressed a couple weeks later when it was still keeping all of its oil and I noticed that the wet oil stains around valve cover was dry!  This product is amazing and the company offers great customer service along with a great warranty! Thank you!

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