I guess at the end of the day each can do what they like. If you wanted to put square wheels on your car you could. Or running a non diesel rated oil in a diesel ~ a very quick way to void an warranty that may exist.
I am running 85c high flow thermostats in my 602 & jeep as using anything cooler appears to result in them taking too long to warm up in the winter as they are driven at highway speed as soon as they are out the front gate (plenty of air flow).
Maybe its just me, but I like to have a warm heater in the winter.

A 60c thermostat would result in freezing my #### on cold mornings.
Maybe the 60c is a low flow design & for some reason it works. I think it would take too long for the motor to warm up.

__________________
Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving