Lots of people do actually, simple search on BITOG can verify that. Not unheard of to see 15-20k drain intervals on the stuff with bypass filtration, even more if your using the NON le version. Delo is a proven performer, especially when you factor in price...
Well, I don't think Delo will last 40,000+++ miles in trucks like ours, using Wal-Mart sold oil/air filters.
Now I will say it can be done up to a point, because Delo is a quality lubricant.
Like you mentioned filtration is key.
Anyone here can extend the oil drain interval using any Diesel rated oil they want if they just purchase the best filters on the shelf at NAPA, for a start, instead of shorter drain intervals with regular low grade media filters.
When spending money to keep your truck going it makes no sense to know the price of everything and miss the value of anything.
Not a lot of people would spend $25 on a oil filter which has more value than the cheaper replacement filter.
Now BITOG has some value, some. If you want the truth from BITOG about long drain intervals they are limited on the subject.
I cant find any value at the site anymore. If you look real hard for long drain interval threads you will notice they don't exist there.
Getting that type info from BITOG is like looking for American Liberty History From a North Korean website, You will get something, but the value is worthless...
Javier