By using Riccati transformation technique, we will establish some new oscillation criteria for the even order neutral delay differential equations [ z ( t ) ] ( n ) + q ( t ) f ( x ( σ ( t ) ) ) = 0 , t ≥ t 0 , where n is even, z ( t ) = x ( t ) + p ( t ) x ( τ ( t ) ) , 0 ≤ p ( t ) ≤ p 0 < ∞ , and q ( t ) ≥ 0 . These oscillation criteria, at least in some sense, complement and improve those of Zafer (1998) and Zhang et al. (2010). An example is considered to illustrate the main results.