Oil prices were mixed in Asia today ahead of a US interest rate decision, with weak demand in an oversupplied market keeping a lid on any gains. 

US benchmark West Texas Intermediate for October delivery was up five cents at $44.68 and Brent crude for October fell 16 cents to $47.98. 

The cost of oil tumbled last week after Goldman Sachs slashed its price forecasts for next year in the face of a larger-than-expected glut. 

Weak demand from China, the world's top energy consumer, is also weighing on the market, analysts said, following another round of weak data on the world's second biggest economy at the weekend. 

Dealers are now focusing on the Federal Reserve's rate meeting that ends on Thursday. 

While expectations are for a rise by the end of the year, the bank's decision has been made complicated by the recent turmoil across the globe caused by the Chinese economic crisis. 

Higher US interest rates will boost the US currency, making dollar-priced oil more expensive for holders of other units, hurting demand and prices. 

Oil prices have plunged from from peaks of more than $100 a barrel in June 2014 as global supply outpaced demand.