Investec has maintained its 'hold' recommendation for oil giant BP, labelling the company's full-year results as 'weak'.Underlying replacement cost profit in the fourth quarter fell to $2.8bn from $3.9bn in the fourth quarter of 2012. This came in 4% above company-compiled consensus forecasts, but the result was helped by a low tax charge.Earnings before interest and tax were 10% below consensus estimates with shortfalls in both the Upstream and Downstream divisions, partly offset by a strong result at Rosneft. "As the only one of the three UK majors not to warn on profits and/or guidance, BP looks like the undisputed champion in Q4," said Analyst Neill Morton."However, this should not ignore a weak set of results - on largely unchanged oil prices, net income is down 24% versus Q3 and 29% year-on-year."Morton said that the bull case for 2014 is that operational gearing could surprise on the upside. However, this could be overshadowed by the legal fallout from the 2010 Macondo oil spill in the Gulf of Mexico.The stock was 1.6% lower at 466.1p by 11:35 on Tuesday.BC