As a Subaru technician,…
As a Subaru technician, owner of a 24 BRZ, and enthusiast of the brand, the oil starvation issue does not come from rtv blocking oil passages. This has been proven by many, even after clearing the oil pickup of rtv people are experiencing oil pressure drops on tracks on right hand turns when pulling large lateral G's. This is due to the oil pan not being deep enough and oil pooling into the heads while turning. While this is a known issue by Subaru, you will not experience this issue unless hard tracking the vehicle, or having modifications such as sticky tires or suspension upgrades to allow the vehicle to pull more G's