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RE: 2005 GMC Sierra 4dr ext cab 4x4 4.8L Been having persistent knock sensor codes and black smoke on an occasional start-up (Also realized I’ve been having to add oil too frequently). Everything I found concering 2-3 seconds of smoke on startup suggested a leaking valve stem seal. So I got...

...not L.A. I'm driving & maintaining a 2005 GMC Sierra 4x4 W/T (4.8L) with ~253k miles. I bought it with 164k miles in 2018. This is a video I shot from the driver's seat. We were rushing from the hunting camp after the Mississippi river was forecast to rise a few more inches overnight. Water...