Hi Nicole, welcome to RCC!
A few more details on your RX8 might help get you clearer advice here - for starters, what year is it, and how many miles are on it? FYI, the earlier RX8s had a number of issues that Mazda corrected on the later models and by doing recalls & TSBs (Tech Service Bulletins). Also, if you have the service history on it, tell us which of the Mazda TSBs and/or recalls were done on it. Ditto on location - folks here can likely point you to a reputable rotary specialist that hopefully is a reasonable distance away.
Other than the fact that Mazda dealer found the engine has low compression, what else is going wrong with it now? Does it not start (when hot or cold)? Run poorly? (i.e., feels low on power/hesitates or otherwise runs like crap).
Pete
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