Oil prices slipped in the international market on Monday, stressed by slowest Chinese economic growth in the last 27 years. Brent crude futures were traded at $66.51 a barrel. US WTI crude futures were priced at $59.93 per barrel. With local and international demand wavering due to the Sino-US trade war, the economic growth in China decelerated to 6.2% in the second quarter from the previous year.