Each of the abovementioned difficulties, especially too much oil use, may lead to turbo failure from the Mazda RX-7 FD. The turbochargers want a constant source of oil to help keep them lubricated and cooled, and if you will find oil problems, the internals will overheat because of excessive friction. https://andresatjyo.blogminds.com/not-known-details-about-jdm-mazda-rx-7-fd-13b-rew-engine-for-sale-30980708