I just had the oil pan of one of these recently but can't remember any difficulty. I forget if the oil pan a mix of allen key bolts and bolts that require a 10mm socket to remove. I think you will need a 10mm socket 1/4 inch drive flexible socket. I use a Snap-on brand socket, thin side wall certainly gets in there with clearance but cost about $25, Craftsman make one as well that is cheaper and may work for you for less than $8 see link below.
Available from Sears on line