September or october
Safe, reasonable, easy to remember!I find it amazing that I'm the only poster in this thread that adjusts OCI based on UOA.
Of course if previous posters change and use different oils at different times, then 5,000 miles is a safe and conservative interval.
UOAs are mostly useful for monitoring the condition of the oil for dirt, fuel and coolant. The rest is more for the sport of it. I would only do UOAs if there was some indicator of a problem. I do 10K OCIs (have for the last 43 years) and call it a day.I find it amazing that I'm the only poster in this thread that adjusts OCI based on UOA.
Of course if previous posters change and use different oils at different times, then 5,000 miles is a safe and conservative interval.