pull the spark plugs and look into the holes with a light. youo will probably see some liquid on one or more pistons. if so, that is where your leak is.
the only way to fix it is to replace the head gasket. this may be more labor than you can do, but it needs to be done. all a block sealer will do is clog up oither parts of your engine. call a couple of dealers and see what they wnat for it.
i had the same thing happen to my 02 Sentra. it cost $1500.
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