That is a very ugly sound. Serious interference and not a just stuck lifter. You can rent a cylinder scope to inspect internals for a possible broken valve spring (short prayer). Drain your oil through a fine screen and cut open your oil filter to look for shiny bits. A small amount of tiny particles is expected. If it looks like a grenade went off inside, the motor is done.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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