Nothing at all!
Only "normal" maintenance required.
90-93 version's crankshaft may break sometime after a timing belt change, but these occasions are rare.
This is a very reliable sports car that handles like few others. It's not a fast car, but is quick enough and very lively at high engine speeds.
If you don't like shifting, there are only a few automatics available (no 1990's however) as it is a much better car as a manual transmission.
It's perfect for a weekend driver, and great also for everyday as long as you don't mind only 2 seats and a small trunk. Also, this car doesn't like snow.
With proper winter tires, the cars does good in the snow. (At least, mine does. :) )
Also, the "short nose crankshaft" problem only appear on 1990 and early 1991 models.
Just thought I'd add something to the original post...I see it mentioned something about there being no 1990 Miatas with an automatic transmission...Perhaps I read the post wrong, but I have a 1990 Miata, plus it has an automatic transmission.
I own a 1988 honda crx-si and I love it, but, my girlfriend owns a 1990 miata and she as well as I also love it. It's manual tranny is great because we both like shifting and you can shift alot in the miata. We put 8mm plug wires in it and a racing beat intake on it. When miata sites say they sound better then honda's I'm ashamed to say that as much as I love my crx to death, the miata has a nice deep purr to it that never gets too loud. Not to mention how great the handling is.
I have myself a 1990 miata, and yes, those cars are very tricky to drive on wet or snowy roads especially when cornering. I think that by carrying 2 baggs of sand in the trunk (80-100lbs) I improved the handling as miata doesn't have enough weight on the back.
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