"An owner who wants to run OCIs well in excess of those recommended by the manufacturer is on his own to an extent, but in practice the margins built into both recommended drain intervals as well as quality oils are such that it wouldn't matter unless the owner totally abandoned common sense and began doing silly-long drains."
I'm not sure what your definition is of either common sense or silly-long drains, but there is a fellow on here named slalom44 doing 30 & 40K oil changes with bypass filtration and UOA. I would call this phenomenal, and he has neither abandoned common sense nor is it a "silly long drain" when comments from the
test lab are "stick with this interval."
http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3405712/Re:_Amsoil_0W-30_41K_OCI_w/byp#Post3405712
Personally, I think the technology exists to eliminate oil changes altogether. I intend to run both a centrifuge and a bypass filter that claims to restore TBN. I have to drill a couple holes in my oil pan and weld return fittings on and build some mounting brackets; so fabrication is going to take me some time...and unfortunately, I'm out of town on business travel, so it's going slowly...
The best method of purifying oil is to run both centrifuge and bypass filtration:
http://www.machinerylubrication.com/Read/29426/purifying-engine-oil
"The best method of purification would be to use a combination of both purifiers and bypass filtration, since each has its limitations. Centrifugal purifiers are good at removing larger particles and water but not for removing the smaller organo-metallic particles, which a filter will remove. If you already have purifiers, keep them and add bypass filtration."
This is me: http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4044692/Re:_centrifuge#Post4044692
This was on another car that, unfortunately, I rolled and completely destroyed avoiding a head on collision:
There are 5 US Patents on this filter; one of them is for time released additives to replenish your TBN:
http://www.processfiltrationproducts.com/puraDYNFilterPage.html
I believe it is entirely possible to make oil changes as frequent as transmission rebuilds; and I guess my brainwaves just don't get a lock on ideas like $2 filters that are designed to get thrown away in 90-120 days or a few thousand miles. I have better things to do with my life other than lay under a car or wait in line for some teen aged kid to sabotage my car and get paid for it. I carry a few quarts of spare oil with me, and keep my oil topped up, but I want to go 100K or more and NOT change oil; maybe never. My apologies to the OP if this is off topic, but where's the thread for never changing your oil and running your car for 300K?