Car has about 98k on it and I'm looking to buy it but I war to know what to look for when buying this car?
I heard the rotary engines wear when they get high miles?? Is that true
What common problems occur at high miles ?
What else should I look for ?

 

With the information given, I'd say authenticity.
Yes.
In rotaries? Low compression, low power, poor economy, and occasionally they will have a little bit of extra oil smoke.
Probably a 2004-05 Mazdaspeed Miata with a turbocharged and intercooled four cylinder piston engine.

Does this make any sense to you?

 

You should ask those questions on Miataturbo.net. They are much more familiar with turbo cars.

 

I'm lost are you looking at a Miata or an RX7 and neither were sold in the US in 2000. The FD stopped production in 95 and the NB1 which is a 2000 model is not the same as a mazda speed.

Now Rotaries. As an owner of one, yes, they are more work than the simple Miata. But, they sound awesome, they are different, and love boost! Mine has 101k original miles, but if you look on the forums (rx7club or nopistons.com) that's not common. I'm planning a rebuild of her this year. They only have 3 moving parts and they don't commonly fail, but the seals are what are known to fail. It seems depending on how you treat them and how much boost you run most people go 40 - 60k miles before rebuilding. My rebuild will cost about $2800, but the builder guarantees up to 600 bhp out of a 1.3L rotary!

To take care of the rotary you will find great advice on rx7club. Entire threads. But in short:

Change oil more frequently
Run two stroke and don't rely on the OMP
Avoid flooding in short start situations by running it up to 3500 RPM and killing ignition
Replace all your 20+ year old vacuum lines (i'm in the middle of this now, it's a bear)
Heat kills on these rotaries, upgrading your cooling (Radiator/IC)
Replace the plugs more frequently

TL;DR: They are a lot more maintenance than a piston car, which means they cost more to maintain. However, they are Really FUN and a little cheaper than flying.

 

Go for the running condition second hand car.

The great article assisted me a lot!