Since I retired and then moved to the PNW my driving habits have changed considerably . Now I can go a few days without driving , then drive a total of 8 miles on a day , then once a month get the Hyundai Sonata GDI 2.4L out on the interstate for a 25 mile drive somewhere . Now 8 months and just under 2,000 miles on the current fill (M1 5W30 EP) and the oil due to the GDI engine is getting dark . Most likely the TBN / TAN of the M1 5W30 EP is holding up but I would imagine even this oil has limits being short tripped (in spite of the occasional interstate run) . Previously driving to work each day I would hit the OCI mileage first before the time limit I set (6 months) . Looks like that has flip flopped in retirement and now perhaps best to just change the oil every 6 months and call it good . *Some may question why I use M1 5W30 EP and the reason is I buy on roll back WM price of $26 per jug . Anyone find themselves in a similar OCI situation now due to new life circumstances ?