I've had two MKIII's, my 86.5 for 6 years putting on 35K miles and no probs whatsoever and my 87 has 67K miles, had it for 1-1/2 years and no probs. I thinks its about two issues: 1) maintenance (coolant system related of course, besides everything else we should do) and, 2) how you drive your car (racing it, driving it in HOT climates). There are many other cars that blow their head gaskets, not just the Supra.
So, most importantly, KEEP AN EYE ON THAT TEMPERATURE GUAGE.
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