My Blackstone Labs test results indicate I can do OCI's of 6000mi., but I usually do betx 5-6K. Not so much as a matter of filter capacity, but amount of remaining "TBN", an additive in the oil.Thanks for this! I found a surplus reseller that had about 2,500 of the standard oil filter - not ultraguard. That would have been a find!
Ordered 12 to compliment the 10 -20004 filters sitting on the shelf.
What kind of OCI are you guys doing? I usually do 4,500 with Rotella 15w-40. I know it depends on the oil but just wondering.
What will your OCI be with these filters?
BTW, I use the Chevron Supreme 10W-30, found at Costco.
Filter is always changed with oil, tires rotated, and driveline zerks get greased at the same time.


