It seems interesting to me that the only engine issue we attribute to oil is complete engine failure. Often we pass off discussions about oil by saying "show me all the ruined engines because of doing 'X' and not 'Y'", but in so many of today's engines, oil quality and cleanliness seem to be paramount to long-term health of CVVT and VANOS systems, timing chains, turbos, etc. I'm not saying that following OEM specs and OLMs will lead to failures of these systems, but it is possible that blindly following directions instead of being proactive could lead to future failures in any of the aforementioned (and those not mentioned) systems.