Kenyan oil marketer KenolKobil (KENO.NR: Quote, Profile, Research, Stock Buzz) on Monday reported a 611 million shillings ($7.98 million) pretax loss in first-half 2009, compared with a profit of 757 million shillings last year.

The performance has been adversely affected by rising international oil prices and inability to timely adjust prices in the different markets the group operates in, the firm said.