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I have one other long shot idea for you. You may want to try an engine oil flush. Add seafoam or other miracle type flush additive to your oil and then run the engine lightly as instructed on the can.
Then change the oil to new oil with no additive.
This flush and change will probably cost you ~$100.
It may be possible that the rings on cylinder 6 are gummed or stuck. This is not likely but is possible. You mention doing frequent oil changes which should have prevented carbon build-up and oiling issues for cylinder 6. The flush should try to remove any buildup or varnish on the rings.
After this, see if you still get low compression.
I'll tell you ahead of time, this is a long shot try, but the cost is pretty low. Good luck.
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bone stock
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