The ST FS oil in my current fill is rated for up to 10,000 miles, and they now have a higher tier oil that's rated for up to 20,000 miles. Geez, and my last OCI I had 1800 miles on the oil. I need to stop throwing away such good oil. At 6 months into this oil fill of ST FS, I now have 2,762 miles on it. So in 6 months I might have about 5500 miles on the oil, at 12 months in. That's where I should do my next OCI, not now. I think it's time that I finally break my 6 month OCI habit. This 10k oil can darn sure take me to 5500 miles over 12 months. There are people here who would run this oil for 24 months at 5500 miles a year.
When I got the car 1/8/2020 it had fresh Conoco Philips FS and I only ran it a few months before changing it to Castrol Edge, and then I drained the Edge at about 1800 miles and added ST FS. I did this because I was enjoying changing my oil and getting a feel for these oils. Now I need to run this good oil longer and get my money's worth for a change. 12 months / 5500 miles would make much more sense than some of my recent OCIs.