Today I made my first boneheaded mistake on my S4. I was at one of the do it yourself pay per hour shops doing an oil change and a quick inspection. Got under the car and drained the oil... or so I thought. Turns out the transmission fluid pan looks exactly like the oil pan, and it says "GEAR OIL PAN" on it. me being the bonehead that I am decided to only read where it said OIL PAN, so I ended up emptying the transmission. But wait it only gets worse, when I had drained about 70% of the gear oil I realized that it smelled awfully weird for what I thought was oil, and had realized my mistake. No big deal I thought, i'll just ask the shop tech if they have any fluid to refill. What do you know, they do have some! so I did my little thing and refilled the transmission. Finished my oil change and set the car down off the lift and moved it outside. Came back in to clean up my bay and recycle all the bottles of oil and everything, when I took a look at the "gear oil" I had put in. Turns out the shop tech handed me ATF and I had just filled my DSG with ATF. At this point I am in too deep, I'm out of my comfort zone, so I call a euro shop, and tell them the situation, they quote me at 600-900$ to do a full flush and replace all of the filters . So I call a tow truck and my car is sitting at the shop currently. When I was trying to get a quote, I called 3 different shops to see what they had to say. And one of them told me that I should do the full flush, and drive it probably 100 miles, and then bring it back in for another flush just to make sure everything was out. Is this good advice? I don't want to turn my already 900$ oil change into a 4000$ oil change when my DSG blows.