I always hung around dad in the garage, and he was a DIY'er, changing oil, rebuilding carbs, changing starters, etc. He had cases of Sohio Multron 10w40 that probably went in everything. We were a GM family: 2 '58 Chevies, a '63 Biscayne wagon, '61 Chevy 1/2-ton pickup, '67 Chevy 1/2-ton, '69 GMC 3/4-ton, '71 Chevy station wagon, '72 Chevy Blazer, '73 Chevy Vega, '71 Chevy Vega with 225 Buick V6 swapped in, '79 Chevy Malibu. These are all cars I remember before going off to college in my (you may have guessed) 1975 Chevy Vega.
In 1978, my brother and I partnered on swapping a 327 Chevy into a '71 Vega. This would be my first "oil change" in that we drained the oil out of the engine when we took it out of the donor car ('68 wagon of some kind), then poured in CAM 2 20W-50 the next spring after shoehorning it into the Vega. My brother still has that car, but with a different engine. We sort of wiped out all the bearings in the original 327 after the pickup fell out of the oil pump. I blame my brother for that one; he liked to do neutral drops.
My first oil change on my own car would have been in 1981 after returning from school in the spring. Probably was out of dad's stock of Multron 10w40. Don't remember the filter. I did annual oil changes on the '75 Vega, and a couple of them were with Arco Graphite 10w40, and always with an AC filter. The first summer I went to school, I didn't change oil in it because it was burning oil about 1 qt per 100 miles. I just took used oil out of dad's oil barrel by the gallon and poured in a quart every week. Then when I got home at Christmas, we took the engine out and had the block sleeved. That was my go-to-school car up to 1985.