One of many things which could result in too much oil intake is apex seal failure which leads to improved clearance among the rotor and housing. This permits internal oil leakage to the combustion chamber leading to grey smoke in the exhaust. Following obtaining burned by two ‘reduced-mileage’ 13Bs from https://httpsjdmengineforsalecomp43184.elbloglibre.com/38033424/the-jdm-mazda-rx-7-fd-13b-rew-engine-for-sale-diaries