I wouldn't say the v6 is prone to thermostat failure.
In all the zs 180s I've owned and that's probably more than any member on here, I have yet to have one fail on me.
I have replaced a few on zt v6 but then I have replaced a few v6 engines in a zt.
The 180 v6 doesn't normally suffer coolant issues.
So I don't agree with the prone to statement.
Also please bear in mind the first zs is now 11 years old so it's entitled to have wear issues with the likes of seals pumps and thermostats.
I remember the old ford pinto engines with the dreaded spray bar failure causing the cam to run dry of oil. They used to go at 30k
The kv6 is a relatively robust engine.
G
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