I'm frothing at the bit to find this one out. I've finished making my new oil lines out of 5/16" brake lines. I have all my fittings ready, including an extra go-between fitting with the restriction if I need it. If I had more time, resources and knowledge, I would just try it both ways and measure the pressure. There's a lot of you smarter and more experienced guys out there - so come on...dish out the knowledge!