It's easy to blow a coolant seal or warp an end plate/housing if you overheat. Easier than blowing a head gasket on most engines.
Also must turbocharged engines don't survive long, but I'm pretty sure that's from running too much timing/bad tune. Tuning rotaries is a real black art, hence the ion sensing.
Other than that they are pretty similar to other sports cars on reliability. If you premix oil with your gas and don't baby them too much they can last without issue for years.
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