I drive mainly highway. The reason for switching is of course a noisy hemi. My Hemi has always been noisy. I have 63,000 miles on it. Want to use a Royal Purple filter.
So tbn and how the engine is running really sets the OCI. Redline is a medium calcium oil so it is a fairly long oci, but if an engine is not running efficiently any oil brand oci will be reduced as fuel gets into oil. I highly recommend you run that filter regardless of oil brand you use in the future. Fairly low miles I think you will be good for the change, watch the oil color on the dip stick, if you get massive cleaning due to miles you might want a short oci this first run. My oil stays amber on the stick over 7500 miles, it's never been black even at 2 years 10k miles. Have you ever changed pcv? If not I would do so, maybe get off on the right foot, should be done every 60k miles imo.
So another thing that the labs use as time to change an oil is ppm metal, now with hemi's these numbers are fked like 95% of the time regardless of oil. The reason labs say to change oil when ppm metals come up is the "sand paper" effect. Now, I'm just not sure how much I buy into this and I have never used that as info to set my OCI, but I am handing you the info for you to decide. If your engine is noisy it is possible you have elevated metals, I would do a uoa at the 5k mile mark with your redline run, just to verify. That number will give me personally a ton of info on what will be a safe oci going forward. Up to you, blackstone sends you a kit for free, you drain off just enough oil to fill their container, follow instructions, you get a uoa WITH TBN.
Now, if you don't feel like doing that I would say 7500 miles OCI is a no brainer safe miles 99% of the time, 10k miles still pretty safe but I have seen low tbn a couple times because like I said every vehicle is different, if you want to push it out to 12k-15k miles I say please do a UOA, and I know many people that do run it 15k especially before the ethanol mandates. I'm not sure how many people push it these days. I don't think there is a situation in gas engines where redline will get you past that anymore. A good practice is also cut your filter open and see how the filter held up and if there are any contaminants caught in the filter.
Mainly highway 95% of the time you will be good 10-12k miles. I'd probably run it 12k miles.
Sorry it was a more simple answer, ha.