Oil check valves..good idea in cases of oil flowing back from oil pan into turbos??
 

The aps are known for some oil issues from likely the gravity return setup not working the best. I did buy a turbowerx scavenger pump that might use but then came across these..
Would these help?? Obviously if they only let the oil go into the pan but keep it from backing up the other way .
Anyone use something like this before.

http://storeworth.com/product/Moroso...eck-Valve.html

If you're having a tough time getting oil to drain from gravity alone I doubt adding an obstruction in the way would do anything to help.