I can't say I ever went THIS far without an oil change. But I did have my 1991 Aerostar 3.0L in 2004-2005. Nicknamed, "The Van Of Questionable Mechanical Integrity". I replaced EVERYTHING on that van short of the engine. And in all retrospect it should have been the first thing to go.
I bought the van for about $1100 with the odometer showing 148,000 or so and it had an oil change sticker on the windshield showing next due at 145,500. So in theory it was already 5500 into the OCI. I had the oil changed at 152,000 (about a 9500 mile OCI) at a Firestone because I had a coupin for an $11.99 oil change. I did not change the oil again, added about a quart every 2000 miles, and concentrated my money on the rest of the van.
Transmission
U-joints
Radiator
Muffler and Tailpipe
Starter Solenoid
Cap and Rotor
Plugs and Wires
Rack and Pinion
Heater Core
Power Steering Pump
Front Brakes*
At 171,000 miles I tried to buy a 2000 model Saturn from a friend by taking over her note lot payments. I left my Aerostar at her apartment complex and drove the Saturn for the next two weeks, paying her for the privilege by depositing $60 a week into her checking account, and then she was supposed to call in the payments on her debit card.
The car got repossessed and I was left without a vehicle. My wife was kind enough to drive me 45 miles away to get my van back. I fired it up and oil sprayed everywhere. I thought, oh crud, 19K miles on this still fairly clean oil, and I just blew up my motor. My wife walks over, says, listen to your voice mail, I did, and there's a message from my now former friend, "hope you don't have any car trouble on your way home". I got under the van and saw two screwdriver holes in the oil filter. The drain plug was barely finger tight. The dipstick had a clear fluid sitting on top of the regular amber oil. I'm guessing they loosened the plug, poked the filter, and then poured something in the oil filler, maybe water, or Sprite, or brake fluid.
Since I no longer cared for this person or their apartment complex, and I needed to be at work two hours prior, I drained the mixture onto the ground, rode with the wife to OReilly, bought a filter and a 5qt of their cheapest 10w30, took care of it, and babied the thing to work. I sold the van for $750 5K later, having NOT changed the oil again. Don't know what happened to it other than it got impounded and sold at auction for $200.
*the front brakes were down to 3/32 thick...and I'm not talking about the pads...I'm talking about the ROTORS...the pads were nonexistent, even the rivets were sheared off. I dropped one pad on the ground from a 4' height whilst turning around to ask my wife something, and it shattered into six pieces!