If engine components fail it can be caused by many factors, and possibly a combination of these factors:
1) Bad metallurgy and or surface hardening, which lubrication can't really "fix".
2) Inadequate parts clearance.
3) Lack of lubrication (an under designed oiling system, or oiling system problem (clogged passage) or outright failure, ie oil pump).
4) Inadequate viscosity (both W rating and HTHS viscosity for the use conditions).
5) Lack of maintenance (too low oil level, too long OCIs, letting the filter clog etc).
If the engine design (1 through 3) are correct, and 4 & 5 are not allowed to happen by whoever is taking care of the vehicle, then chances of an engine failure is very remote.