I believe Mobil 1 has only focused on one thing for oil and extended service. The oxidation rate. But oil service is a big can of worms and one of them worms is the base number. Acid build up? Maybe POE helps there, don’t know? So many good choices out there, almost all of them point to shorter than 20,000 miles on oil.If you have a modern GDI engine - they can trash an oil in less than 5,000 miles ... My Hyundai 2.4L GDI engine trashes oil like it invented the term !! Soot and fuel contamination are the main culprits for shorter OCI's . Conversely , a non GDI (MPI) engine can go longer between synthetic oil changes . *Typical suburban mixed driving gets 5K miles / 6 months (MPI engine) while GDI engine gets 4,000 miles / 4 month OCI with synthetic oil . Oil analysis reports suggest that is about right for my stable of Korean / Japanese vehicles. Last vehicle ('07 Sedona 3.8L MPI engine) never burned a drop of oil out to over 300K miles before trading it in for a smaller vehicle . This protocol works for me - besides I could blow the cost savings of a 10K mile OCI with a plate of wings and a pitcher of cold beverage !