In the supposedly bad old days i worked for a mid sized haulier who maintained exceptionally well, but worked them hard and fast at full weights, he always said oil was cheap repairs and downtime were not.
Engine oil at 15k miles, gearbox and axle oils every third service so 45k miles, on the usual overspecified drivetrain of ■■■■■■■ Fuller Rockwell.
No prizes for the failure rate over the average 7 years from new they were kept.
Learned a lot there, and similarly always overmaintain my own cars, no prizes for the failure rates here either.