At least on the Lexus RX300 the oil pan plug looked different from the transmission pan plug. By the way, while my wife was away on business, I changed the oil and filter on the Lexus because she had been talking about it for weeks. Heretofore, I had always changed it on my car but never hers. Also installed new batterry while she was away. When she got back, I proudly said, "Honey, not only did I get you a new battery while you were gone, I also changed your oil and filter." At whch point she says, "Why did you do that? I had the dealer change the oil and filter 2 weeks ago." Talk about not being able to win for losing!