Strictly from a business viewpoint
the small sum of money saved by having a cheap rate crew overhaul the engine
is far less than the $ damage.

Years ago I needed an EMD diesel rebuilt out of a GP-38 locomotive.
We got bids from several shops, one of which located near New Orleans did mainly ship service diesels.
This shop sent one of the owners to “sell us” on why his business should get the job.
One of his arguments was:
“Our marine customers hold us to much higher standards than railroad customers because if an engine goes bad at sea it is much more of a life or death situation.”

We gave that engine rebuilding shop the job and they delivered an engine that performed well and very noticeably leaked less oil than even factory new GM EMD engines did.