This is what stop leak does.

[tHE_0ne]

Saw this on a local forum, looks like charcoal!

This is for anyone who has ever used BARS stop-leak or that no-smoke **** for your engine to repair a rear main seal or fix worn valve seals.

This is a 120K mile motor. It is a 6.0L LS motor from a 2500 Series van. Upon removing the valve cover, we knew this motor was a ****ing mess. This is what your engine looks like inside if you use stop-leak or any other main seal repair. we now have to completely disassemble the motor and hot-tank it to remove all this ****.

please don't use that ****. Your engine doesn't like it.

[tHE_0ne]