Noticed my port engine smoking more then the Stb. Could it be rings or crankcase blowing past the turbo? 7000 plus hours on these bad boys. TAMD 41's. Anything to get me buy this summer . Not ready to spend more money and do major surgery on these old guys. Any experience on this subject. Dont think a cracked ring,m just worn out maybe. Maybe add some heavy syrup like STP. Just kidding. Thanks for any feed back. Al