Yep, the standpipe that supports the filter cartridge has a 1/16" orfice to control oil flow. Flex lines bigger than 1/4" ID are just a little hard to manipulate in the somewhat cramped space they need to occupy without getting against the exhaust pipe.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!