These 2 filters are for a Toyota 1mz-fe. 1 has a relief valve and the other doesn't. Is the relief valve necessary?
http://ecat.arvinmeritor.com/smartlink/?partnum=pl24457 pl24457 pureone
Type of Filter: Spin-on
Thread Pitch: UNF-2B
Anti-Drain Back Valve: Yes
O.D.: 2.98
Threads: 3/4-16...