I have had 3 Rx7’s. 82, 90 & I currently own an 89. I have never had an issue with the engines. The 90 has an auto transmission which failed at 100,000. My 89 is almost 30 years old and doesn’t even leak oil. How many piston engines can you say that about. It has 58k miles on it and it pulls really strong. These cars have their quirks but being unreliable is not one of them.