Vienna - The price for crude oil produced by the Organization of the Petroleum Exporting Countries (OPEC) slid near the 80-dollar mark Monday, as global stock markets were in turmoil.

One barrel (159 litres) of OPEC crude stood at 81.57 dollars Monday, 4.80 dollars lower than 86.37 dollars last Friday, OPEC said Tuesday.

The cartel calculates an average basket price based on 13 important brands produced by its members. (dpa)