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Finally got around to taking my G8 to the shop. Had P0304 pop up last year and it has been sitting for months. Anyhow, compression test shows 80lbs on number 4. Leak down test shows 70% leakage going into the engine crankcase. Other cylinders are fine. Mechanic says the issue is in the lower end and needs to be pulled and torn down.

So it is now back into my garage, weighing options...
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