I usually go 10k anyways but this time I changed it after nine months an 7424 miles.
I haven't had an analysis done in awhile and found a test kit bottle when unpacking stuff recently.
I'm happy with what I see here and will most likely stay around 10k changes.
Rotella T6 5W40 & Donaldson DBL7349.
Fairly impressed with turnaround time, mailed it on 6/11 and sample results back on 6/19.