One shop I worked at I was replacing a turbo on a full size city bus. You need to clean out the air charge system to remove any oil. I was in the process of removing the charge air cooler when the boss came up and asked how much longer. I responded it will be done after lunch. I'm flushing the cooler. He said I need it now, just put it back together and drive it and it will clean itself. Being young and dumb that's what I did. Lucky for me the road we were on was in a commercial area. As soon as I turned out of the lot it was like I turned on a 1000hp nitrous system. Thick smoke everywhere. It accelerated three times as fast as it normally would have. I had one heck of a ride for about an 1/8 mile. I swear I bent the brake pedal trying to stop. Was I pissed. From that point on I did not listen to that guy. He thought it was funny. I almost had to visit the men's room to change my shorts.