Normally I use PP 5W20 synthetic and run in the V6 '07 Kia Sedona for 6,500 to 7,500 miles run mostly in suburb driving conditions . Yesterday I saw Mobil 1 Extended Performance on rollback at WM so I decided to try it in 5W30 (all they had) with a Fram Ultra oil filter . Both the extended performance and Fram oil filter claim : "Good for up to 15,000 miles" which I assume is best case on easy interstate driving . So my plan for the Kia driven in the suburbs is to run the extended performance for about 9 months / 13,000 miles (which ever comes first) ... Your thoughts on this proposed OCI with the Fram Ultra and Mobil 1 Extended Performance synthetic oil ?