Castrol India has posted a 19% increase in net profit to Rs 31.96 crore for the first quarter ended March 31, 2005 as compared to Rs 26.82 crore for the quarter ended March 31, 2004. According to a release issued by Castrol to the BSE, total Income (net of excise) has increased 10% from Rs 296.50 crore in Q1-04 to Rs 325.11 crore for the quarter ended March 31, 2005.