Never worn out an engine. Ever.
As an example: I put over 200K on an Olds 350 V-8, flat tappet hydraulic cam and youthful exuberance (foot to the floor, often) notwithstanding...several starters, water pumps, alternators, but never anything inside that sturdy V-8...running on dino 10W40...the one thing that engine had going for it was the 3,000 mile OCI...
Every car that I've sold was running great:
1977 Olds with 210,000 miles on it.
1985 Trans-Am with 95,000 on it (flat tappet 305 V-8)
1985 Volvo Turbo with 160,000 (OHC Turbo 4 cylinder)
Every car that went to the crusher because of rust had a perfectly running engine:
1970 Ford Fairlane (302 V-8, 130,000)
1981 MB 240D (235,000)
Even the cars I've lost had perfect engines:
1993 Volvo 850 (totaled at 185,000 miles NA 5 cylinder DOHC)
1995 Explorer (4.0 V-6 -150,000, ex wife kept it)
2000 Expedition (5.4 V-8, 75,000, ex wife kept it)
and the ones that I own now?
The Packard has 62,000 on it.
The XC has 165,000 on it.
The T-5 has 140,000
The MB has 61,500
The Corolla has 106,000
The 300E has 115,000
the 4 Runner has 237,000
In all of those cars, I have never worn out an engine (lost compression, ring failure, bearing failure, valve failure, cam failure). The proper oil and an appropriate oil change interval have kept every engine I've owned to last the life of the car.
For me: accessories come and go. Rust kills them. Accidents kill them. But engines last forever...