Yes I have….oil blew out of the Turbine Labyrinth seal on a 250 C20B causing a massive smoke cloud out the exhaust that would have the turned the Snowbirds green with jealousy. It. was like landing in fog. Oil pressure was at the bottom of the green when I landed, I didn’t do the cool down before shutting down. When I looked out the back there was a smoke trail for a mile behind me. Luckily I was on approach to the pad when it happened. The engineer saw it all happen.
And they do generally pack them with a lot of baby powder.
Have you ever seen an exhaust spit out a plume like that without being on fire?
Look at the Stbd skid towards the end - it is bright orange indicating that the flotation bag has started to inflate - not fully in this case so perhaps the nitrogen escaped enhancing the 'dust cloud'.