West Texas Intermediate oil decreased for a second straight day on Tuesday amid concerns that inventories in the U.S. advanced by 2.3 million barrels last week to its highest level in more than 22 years. May WTI futures dropped by 45 cents to $96.62 a barrel on the NYMEX and were $96.81 at 3:23 p.m. in Singapore, following a yesterday's fall to its lowest since March 27 at $97.07.