Because of the Bar's Leaks 2X Action formula, the product has additives to work on any of the three types of rear main seal, no matter the material.

The seal restorer additive restores seal size, flexibility and elasticity lost due to engine heat, age and high mileage. The seal polymer works by building a polymeric film around the rear main seal and also filling in any groove worn into the crankshaft by the seal.

Yes, Bar's Leaks is one of the only transmission stop leaks that is compatible with all petroleum-based transmission fluids including synthetics.

Yes, Bar's Leaks Jack Oil Stop Leak is compatible with all petroleum based, mineral oil, and synthetic fluids.

After time, jack seals and o-rings tend to dry out and shrink. Bar's Leaks revitalizes these seals and o-rings and makes them soft and pliable again.

Yes, Bar's Leaks is one of the only Power Steering Stop Leaks that is compatible with all petroleum based, mineral oil, and synthetic fluids. This includes all domestic, import and heavy duty power steering applications.

Most Bar's Leaks products are compatible with all types of antifreeze. This includes the liquid Radiator Stop Leak p/n R6, C16; Pelletized Stop Leak p/n PLT11; Liquid Aluminum Stop Leak p/n 1185; tablet p/n HDC, J120 and powder stop leak p/n G12BP, 1175. These products are specifically designed to be directly added to the cooling system without having to flush out the antifreeze.

Yes Bar's Leaks is compatible with ALL brands of antifreeze including conventional green or blue (silicate-based) and extended life red/orange or yellow (OAT/HOAT) coolant. 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.

No, the tiny particles will pass through a 24-gauge mesh screen which is the spec 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 the only stop leak 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.

After time, engine oil seals tend to dry out and shrink. Bar's Leaks revitalizes these seals and makes them soft and pliable again.

Our E10L (15.5 oz.) is designed for one bottle to be installed in a standard passenger car or light truck. For larger systems, use 1 bottle for every six quarts of oil.

No. Unlike our cooling system product, Bar's Leaks Transmission Stop Leak has no particles to plug the leak, it works chemically to stop leaks in gaskets and seals.

After time, transmission seals tend to dry out and shrink. Bar's Leaks revitalizes these seals and makes them soft and pliable again.

The more in depth answer is: A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. The engine oil lubricates the crankshaft, pistons and other internal parts of the engine.

For most rear wheel drive vehicles the transmission is removed to replace the seal. On front wheel drive vehicles, it is usually easiest to remove the engine to gain access to replacing the seal. Either way, this is an expensive procedure.

No. Unlike our cooling system product, Bar's Leaks Engine Oil Stop Leak has no particles to plug the leak, it works chemically to stop leaks in gaskets and seals.

Yes, Bar's Leaks is one of the only engine oil stop leaks that is compatible with all petroleum based oils, including synthetics.