MELBOURNE, May 6 : Oil was little changed at open on Wednesday morning after a volatile session on Tuesday with U.S. crude oil inventories falling for a third week in a row as the shaky Middle East ceasefire held. U.S West Texas Intermediate was up 15 cents, or 0.15 per cent, to $102.42 per barrel as of 2251 GMT. WTI closed down 3.9 per cent after the ceasefire held despite reported exchanges of fire, while Brent fell 4 per cent to close at $109.87. U.S. crude oil inventories fell for the third