500g/l of glycol, a new thermostat and a good gauge is your best insurance for 1kz's and 2lt's.
Ive had about 4 2lt's so far, never blown one from overheating (only valve seats fracturing once).
On my first 1kz, its got 250km's on it, driven like a rental and doesn't complain even up the lindis or ski fields. Great engines.
Chris
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