not necessarily . . . take pics of it and post we might be able to help. A few things could cause it. Is there build up in the exhaust or is it just smoking. I have seen some Rx-7s burn alot of oil it would be the Oil rings on the rotors or maybe even the main seals all depends on how bad the smoke where it is coming from etc. . .But I doubt its the apex seals . . . check the compression thats the best way to check apex seals