I actually did an oil change in 1999 (my first ever!)
it was on my 87 Olds 98
it got PYB 10w30, and an original Blue PureOne(new product at the time)
prior to that it had either gotten serviced at the Dealer (was grandpa's car, I got it when he passed)or like the rest of my family's cars, at the Local BP Procare. with some sort of jobber filter, and i assume a bulk castrol product.
after that OCI, a new Valvoline instant oil change opened in front of my work, and I used them for the Next Decade, until I started doing my own again, and found Bitog.