additive

I noticed by rear main seal was leaking is there a additive you guys can recommend? It's not leaking like crazy but it's noticeable no drops on the driveway yet so hopefully still fixable. Something that will really work I know I should replace the rear main that's the only true way to fix it...

Got an oil leak on my '94 Explorer. Not huge, but enough to require a quart every month or two and to make a mess on the driveway. It's not the oil pan gasket, but the next one up (lower intake manifold gasket?). Someone recommended adding Gunk Bearin' Sealer to see if it stops the leak...