The oil change is pretty easy. I drove my Spark up on some garden stones stepped two high to have a little room underneath.
15mm drain bolt size, used a pliers styled oil filter wrench that fit up there just fine. There isn't much room to rotate, so just be patient and use 1/10 turns at a time until it is loose enough to remove by hand.
A little over 3.5 quarts fills it to the middle of the hash marks on the dipstick.
Interesting. On my Spark it took exactly 4 quarts, which is what the manual calls for. Yes the filter is tight and I wish there was a little more room.