Bar’s Leaks will seal external, internal and coolant to oil leaks. Once installed, the Bar’s Leaks particles shrink up to 15 percent. On an external leak, the tiny particles flow to the point of the leak. They then collect at the outside of the seepage and build inward. Internal leaks, the Bar’s Leaks particles will burn when subjected to the 5000°F heat of the combustion chamber to seal seepage and small cracks. On coolant to oil leaks, where coolant can seep into the crankcase contaminating the oil, the tiny Bar’s Leaks particles will seal the pores in cast iron and aluminum preventing seepage.

We recommend you drive/idle vehicle for 15 to 20 minutes. In most cases the leak will be sealed within this amount of time. If the leak is not sealed, a second application may be required.

Yes, this product is specifically designed to be directly added to the cooling system without having to flush out the antifreeze.

Yes, Bar’s Leaks works with all types and colors of antifreeze coolant including conventional, extended life, waterless and straight water.

One package treats systems up to 15 quarts. Use one tablet for each three quarts of cooling system capacity.

If the vehicle does not have a regular radiator cap, remove the top hose where it attached to radiator and insert tablets in hose and then reinstall hose.

Just add tablets to warm tap water.

This is one of the few products ideally suited for use with waterless coolants, like Evans brand, as it does not contain water. When using with this type of coolant, do not pre-dissolve the tablets in water.

No, the tiny particles will pass through a 24-gauge mesh screen which is the specification for the BIG 3 car/truck manufacturers. They say that any product installed in the cooling system must pass through this screen. Bar’s Leaks is one of only a few stop leak products to pass this test and to be approved by the vehicle manufacturers. Note: If using Bar’s Leaks to stop heater core leaks, make sure you turn your heater control to HOT. Some vehicles have a valve that controls coolant flow through the core.