My OCI was typically in the 5,000-6,000 mile range. Could have very easily run it out to 10,000 with Mobil 1 EP. 5,000 mile intervals are easy to remember and notice.Just curious, what were your OCI's? WIth the 5.7 quart sump in my Escape's 2.5 it seems that it could easily do more than the 6K that I average on full synthetic. The oil always look clean when drained.
Full disclosure, my Fusion had the 2.5L HYBRID engine. Consequently, it wasn’t always running in a gasoline mode, even though 75% of my driving involved highway miles. That’s an easy life. I wouldn’t be surprised it that vehicle had over 300,000 miles on it (wherever it is).