Oil filter change vs oil change

The oil change interval for my 1965 Barracudas 273 was 7,500 miles in normal conditions and a every other filter change.. That was with 1965 Dino oil spec's. Oil has come a LONG way Baby since 1965.

Our 1998 Buick 3.1 V6 had a Change oil system light that NEVER came on. Just once I ran the oil out to 10,200 miles and the light never lit up and I chickened out and dumped it. Spec oil was 5W30 but its life was 7,500 miles and dump with new filter and almost always Delo 400 15W40 and it made it to 355,000 miles when the trans let go.