Your MDX does have a fill hole. It's on top of the transmission. It's usually a 17 mm bolt. If you had the oil jet kit which was a bulletin installed, you remove the oil jet kit by pulling the 12mm bolt that held it in a full from there.
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I just wanted to introduce my CWP 09 Mazdaspeed3 GT. Mods are:
Cxracing fmic kit
Catless downpipe
Autotech hpfp internals
Corksport sri plus tip
Forge recirculation valve
JBR sifter plate
Cobb accessport stage 2 of the shelf map