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The kv6 in the 75 and zt isnt the most reliable. The auto zt is the worse im afraid to say.
For some reason, ive seen zts and 75s do headgaskets and have crank bearings fail.
I agree to some extent, that cooling issues stem from the thermostat and cooling fans.
However, Im now beginning to believe that its got something to do with the aerodynamics of the engine bay. I.e it gets too hot under there and it cant dispell heat quickly.
Mercedes had this issue with a bullitt proof engine they fitted to a car, which then got put into another model of car. In one car it lasted and didnt give any grief, but in another the engine kept failing. Turned out to be the tightness of the engine bay not allowing it to expend heat.
The zs doesnt have any of these problems with the KV6. So it must be the reason for failure in the zt.
G
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