Thanks for the feedback everyone.
Warranty period was 24 months or 2K hours. I used Onan Oil and filters during the warranty period.
As Cummins infiltrates Onan product line the filters kept changing so I used genuine kubota filters.
This particular run was filtered with a microgreen, bitogs favorite thread buster, and I was pleasantly surprised to see only a trace of insolubles and an excellent filtration comment from Blackstone. Im surmising its tiny microdisk will only hold so much and once I reach its tipping point Ill basically report within averages, but so far so good.
I run 0w40 in lots of devices so I tend to have it on hand.
It meets spec, is relatively inexpensive and easy to acquire..
500 would be phenomenal, Ill keep ratcheting up the time and reporting back. Its a pain to change the way its set up.
Once I get the formula Ill basically mirror it on genset 2 with maybe one UOA to make sure everything's as it should be.
UD