Originally Posted by
sinsilvia666
well not so much smoke on start up but there is a little jet / stream of it coming out on the bottom center of the engine when running and its even more pronounced when they taxi in after landing. i was thinking some excess oil burn off like engine blow by on a car?
Could possibly be fuel venting. On older engines, there was often some fuel dumped on shutdown but the EPA standards now prohibit that. Most is captured but some apparently still is 'released'.