West Texas Intermediate oil advanced for a second straight day on Friday heading for its second weekly gain, at the same time May Brent crude futures advanced 0.3%, but it has declined 1.4% this week and is poised to its weakest weekly performance in eleven months. April West Texas oil futures advanced 34 cents to $93.37 a barrel on NYMEX and were $93.25 at 3.17 p.m. Singapore time.