I bought a small funnel kit at Wal-mart that works great for this purpose. It's the kind that screws onto the top of the oil bottle. Rather than screwing it onto the bottle, I just stick the small end of the funnel tube into the side hole and then pour the tranny fluid into the round hole that is supposed to screw onto the oil bottle. This way I can control the oil flow & quantity much better. Works like a charm.