SINGAPORE (AFX-ASIA) – DBS Vickers Securities said it has further increased its 12-month price target for China Aviation Oil (S) Corp Ltd (CAO) to 1.71 sgd per share from 1.28 sgd previously, on hopes the company will post stronger earnings next year. (US$1=S$1.72). “Our sum-of-the parts target price of S$1.71 is still based on conservative…