So this started as a whatzit doing project. My OVS was always a little oily and every time I removed the air cleaner ( I had because of a new starter installation) I would notice oil pooled in the #1 and maybe #2 throttle body intake. Me thinks that wasn't right. SOOOOOO. I took off the OVS and sure enough it had lots of rust crustaceans inside and the top was pinholed in two places.. So I did all the solvent and part cleaner dunks and have it to where nothing but clean solvent comes out it. Stage II -- what was causing the oil to pool in my intake? Ahha!!! Check the return line to the dip stick Easy enough.. blow 90 PSI in one end and it should clear it if restricted... NOT... it's blocked solid and the return was not doing ANYTHING!.. SOOOOO I take a a 18GA galvanized wire and loop the end tight to keep the end from snagging and hanging up in the line as I fed it into the line from the right side of the car. I got in about 6 inches when I hit the blockage which was like rouge mixed with axle grease after 47 years... Now I know how cardiovascular surgeons unblock arteries except i didn't have the camera on the probe.Then I worked the wire down another foot and still had resistance. SOOO I filled the line with Brakeleen and went to bed...Today I strung the wire through the hose until...EUREKA.. It appeared on the other side... More back and forth and some gas or Brakeleen to get some more crud out and it should be operating now as designed and allowing oil back in my sump rather than my intake. I think I have that right? Periodic seasonal checks will be the order of the day from now on especially with the rust component under control in the OVS. I am surprised there isn't a note in the manual to stay on top of this which is inevitable. Anyway.. Hope this helps people from having to try to string a new return line which is not easily done the way the factory did from my perspective.... I have thought about putting a tiny see-thru in-line fuel filer on the return line. Any thoughts?