I am a long time lurker but had to make an account, on my way out this morning I noticed the mdx had a leak underneath it, (its usually oil from the main rear gasket) but then I also noticed the odd sandy yellow color. Anyone have any idea what its leaking? (power steering fluid?) Otherwise the mdx has been in my family since 2001 with only major issue being the transmission rebuild, its not used often anymore but its a great car to move stuff/foodshop/in the snow for us.
To me, it looks like oil that has mixed with water. If you have a pre-existing oil leak, maybe you also have a head gasket issue that's causing the coolant to mix with the oil and then leaking from the same area as before. Check the color of the oil by pulling the dip stick or even the oil fill cap. Have you looked to see where this new leak was coming from?