Oil prices clung near $68 a barrel for a fourth day Monday in Asia. Benchmark crude for October delivery was up 33 cents at $68.35 a barrel by late afternoon Singapore time in electronic trading on the New York Mercantile Exchange. The contract Friday rose 6 cents to settle at $68.02. In other Nymex trading, gasoline for October delivery was steady at $1.78 a gallon, and heating oil gained 0.65 cent to $1.73 a gallon. Natural gas held at $2.72 per 1,000 cubic feet. In London, Brent crude was up 35 cents at $67.17. -- SPA