Not oil pressure related, at least not from Gallery Gaskets. Mine is a 2011 but I had that service done in October and this problem has existed far longer than the gallery gaskets. Also just swapped out injectors with reconditioned flow checked OEM injectors so it shouldn’t be a fuel delivery...
To rejuvenate this forum, did anyone ever determine if oil viscosity was a factor in slow cranking? I have a similar issue but I was leaning more towards a diagnosis related to either my starter being weak or the CCA or Cranking Amps in general for my battery as I’ve always used 640CCA batteries...