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Just to reiterate a few ideas that people already mentioned but I own a '94 FD3S and I run premix in every tank of gas, change the sparkplugs every 5-7k, change oil every 3-5k. I am running a Power FC ECU with Streetport, so I have to take care of my car more often, but a stock 13b in an RX-8 shouldn't be much different. I got my it last summer with a rebuilt engine with about 25k on it. Compression was already in the mid-90's in the rear rotor from the previous owner's lack of care. But it's stayed there (mid 90's psi) with the ~20k additional miles I've put on it, primarily because I follow simple steps with maintenance and provide enough cooling.
Having said that, I know the RX-8 doesn't have the same heatsoak and cooling issues as the RX-7 but the 13b engine in there needs to be taken care of just the same way. Maintenance isn't particularly that much more expensive. Oil changes do need to be done a little more frequently and spark plugs need to be changed I'd say twice in the time you change your oil and oil filter 3 times. If you follow those steps and run premix (Idemitsu premix is amazing and relatively affordable) in every tank, you'll have a good engine and will last you much longer than most. My friend owned an FD with an aggressive streetport that he did himself and his engine lasted almost 80k of aggressive California heat tracking and daily driving.
You'll love the car if you know how to take care of it. Rev it all the way up occasionally and hear that 13b roar. Good luck with the car!
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