455 V8. This is high option for a Delta. I had no idea you could get six way power seats on both sides of the front split bench. Also, check out the passenger side mirror remote on the passenger door panel. 1976 OLDSMOBILE DELTA 88 4 DR, SEDAN 455 MOTOR ONLY 39,856 NO RUST -... (craigslist.org)
Most car makers did. I guess Olds engineers felt that Granny and Gramps would always travel together.