Have radiator checked, pull injectors and have serviced, replace oil in viscous fan coupling, and regularly check front lower ball joints, mine has done 500,000km no worries, The head cracking is due to a poorly maintained cooling system or an over fueling fuel system. 3inch dump pipe and exhaust system makes a world of difference to performance and exhaust gas temps. Google prado lower ball joint failure and you will see why regular inspection is required.
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