Just did DSG oil change earlier. You can fill from the top via the oil filter housing in 15 minutes if the oil is warm enough. Just buy the 4-5 dollar funnel with the hose at walmart, it has the perfect size tip that fits perfectly. I'm not the first to do this, so don't let anyone tell you that the filling from the bottom is faster or better. Why waste time and money making a tool when you can buy a cheap funnel and fill from the top! Did not have to remove battery either. the only thing that was inconvenient was finding the right size hex socket for the drain plug and having to wait forever for the transmission to cool after draining.