I know this is gonna sound stupid but sometimes we have to check the lil things first. Hell, we sent a 911 GT3 to a shop in Ohio because no one checked the gas level in the gas tank...yeah...needed a tune anyway, lol.
If this engine truely only has 7 miles on it...what kind of oil are you using? Conventional? Synthetic? Synthetic is the only reason i can think of that a brand new engine, built properly, would have that much blowby....i know, stupid question but just checking the basics.
Frost - 97 GST