We changed the oil in the 99 4runner today for the first time and switched it to Mobil 1 5-30W. Spent a while looking for the oil filter. Can't see it from the top and couldn't see it from the bottom until I removed the skid plate. Did a search and Yota tech and there is a flap in the wheel well that you put your hand through to reach it. It's not talked about in the owners manual and I have not found a FSM for it yet. Guess I'll ask CDan how much an FSM is. Just seemed odd that it was so hard to find. Kind of like they were done with the engine design and then said, of shoot where should we put the filter. Then they put the engine in the truck and said, oh shoot, better cut a hole in the wheel well.