1995 Toyota 4Runner 4 Runner- water in the oil: bad head or

Engine Mechanical problem
1995 Toyota 4Runner 6 cyl Four Wheel Drive Automatic
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Hi guys,
I'm an old time gear head so I'm not really familar with all the new stuff out, BUT I was told there is some kind of junk you can run through the engine that can temp. fix a bad head gasket.
Does anyone know of any such animal?
It supposed to do what Bars Leak did for radiators.

Thanks for any advice you can give me.
I want to run this motor for a bit to find out whats messed up head or gasket?

Ms Kim[img:64f85312db]http://www.2carpros.com/forum/automotive_pictures/55992_toy1_1.jpg[/img:64f85312db]