It may be that I will need to store my RX-7 for some time (measured in months). What needs to be done to protect it, mechanically (the engine, in particular)?

 

gas stabilizer

 

leave the oil in... and maybe put some MMO or ATF in the motor...

 

I would suggest using the additive "Sea Foam" instead of gas stabilizer. I stored my '82 GSL last winter, and the last driving day I put half of a can of it into the gas, filled up w/premium, and put the other half into the engine through the oil fill cap. Then I drove it around for about 20 min. and put it into storage. This spring, she started right up the first time with 125,000 and didn't smoke a bit.
Gas stabilizers do work, but I highly recommend using this stuff. Also, how are you storing it? (indoors, outdoors, heated, etc.)

 

Do a Search on SEA FOAM here on the forum. Supposedly some guys have blown their engine because of it.

I would use MMO down the carb and turn it over by hand. Also a litle in the tank.