Sorry for this probably silly question. I'd like to change the oil in my 2001 Rodeo Sport, but there seem to be two plugs underneath that look like likely candidates.

Both plugs are approximately in the center of the vehicle. One plug (fits a 19mm socket) is centered on a flat relatively large rectangular housing, and the other (larger than 19mm) is centered on a smaller more ribbed looking housing.

Anyone know which plug is the oil plug and what the heck the other plug might go to?

 

New to this forum myself. Post a picture or link to one and will tell you what it is. Should be the first one you described though with no cooling fins. A picture and we can tell you for sure.