As mentioned before, my OCIs are by mileage not time, usually between 7k – 7,5K and I keep it topped off. Stock mopar filter 4892339AB on both samples. The W20 oil reprogramming has helped greatly having to only add 1qt. starting after 4,000 miles into the OCI and then keeping it top off until I reach 7.5k. From the report my previous OCI is 17 months/7,405 miles and most recent is 20 months/7,061 miles.