[nbleak21]

Credible answers come from compitent questions, and compitent effort...

Do a compression check. It will take a compitent person less time then you've spent reading the three pages of this thread.

If the engine your talking about is a b-series (guessing by the teg in your garage), it's likely rings or HG, as those are usually the first to go.

There is no perminent solution in a can.
There is no perminent solution in a can.
...
There is no perminent solution in a can.

I am an avid believer in seafoam and ZDDPlus for preventitive maintenance and recovery due to a lack of, but in no way will they fix worn rings, out of round cylinders, blown/warped head/gaskets etc.