Among the list of things which could lead to extreme oil usage is apex seal failure which results in improved clearance involving the rotor and housing. This allows interior oil leakage in the combustion chamber leading to grey smoke through the exhaust. Truthfully I have acquired parts from many importers https://lukasaijnl.articlesblogger.com/60286283/facts-about-jdm-mazda-rx-7-fd-13b-rew-engine-for-sale-revealed