Which were originally designed to pump oil in Canada
Then became the core of an aircraft APU!
The -20 is old, a bit temperature sensitive and prone to chewing up hot sections, compared to later PT6s including the -27/-34 family and it's derivitives.
The Cessna 425 uses -112's that are nicely derated to only 450 ESHP. Fit a Shadin ECTM and monitor trends, regular compressor washes, boroscope at regular intervals and the engines should be totally trouble free.
