It is funny how the people who didn't know any better, or the quickie lube industry that seemed to come on strong back in the '80s, seems to have made myth into legend. If anyone bothered to read the owner's manuals, on any car made in the last 50 years, they'd find this "3k mile oil change interval" simply didn't exist, or not in the way we have been led to think.
I am one of those nerds that reads owner's manuals, in all kinds of cars... used cars that I bought for resale, new cars that I bought, etc. In addition to a myriad of VAG products I have owned over the years, covering pretty much everything you can think of from air cooled boxers on up, I have also owned many other cars. I also have worked on many other cars. And I've read a LOT of manuals, in particular the PM sections.
I'd really like to know where the 3k nonsense originated.
In 1984, when things were good in this country once again after the awful '70s, and Reaganomics was kicking in strong, a bunch of my extended family bought new cars. My dad bought a Ford Ranger, my grandfather bought a Dodge Omni, and aunts/uncles bought a Pontiac Sunbird, Chevrolet Chevette, Jeep Cherokee, Nissan Stanza, and a Subaru GL wagon (which started rusting away later that month). I probably read ALL of those cars' manuals at some point and time (I said I was...am? ... a car nerd). None of those cars I can recall having a service interval that short. They were mostly 5k or 7500 miles. My '89 Toyota pickup even had 10k miles "under normal conditions" and 7500 "under extreme conditions" on a sticker on the airbox of its 22RE engine. My '87 Mazda B2000 was 7500 miles "or 7.5 months, whichever came first". The 1966 Ford Mustang I had for a short time had 6000 miles printed on its oil cap.
The most common interval now is 10k miles (Toyota, most Hondas, most Fords) but a few may still have 7500. Some are technically flexible (GM) and can go as high as 20k miles. Most BMW/Mini is 15k. Most MB stuff if fixed is 20k, or flexible (which can go as high as 25k). We have many fleet Fords we service here (F150s, Focuses, Transits, Transit Connects) that are going strong at 300k+ miles with 10k service intervals, and these vehicles are just getting the cheap bulk no-name 5w20 motor oil, and they NEVER get their oil checked by the operators unless a warning light comes on... and even then, they are more likely to keep driving them until they bring it in here, LOL.
The only cars that really suffer motor oil related problems are ones that consume oil AND get run a long(ish) time AND never get topped up. The bad oil burners are well known, there are really no surprises. Many Toyotas, some older Hondas, ANYTHING Subaru, and a few select GM and ChryCo products. BMWs have a hard time just keeping the oil in the engine due to leaks.
But seriously, if you just don't run the darn thing out of oil, it isn't going to suffer and going the full manufacturer specified interval is always going to be the least costly and makes the most sense. And if you DO have an oil burner, you most certainly would want to go as long as possible, wouldn't you? I live in a universe where it is FAR easier and cheaper to open the hood and top off the oil periodically than it is to DRAIN it all out repeatedly.