For the last 2 years I’ve been running just the 2 vents off my valvecover. No drain back, yea the car sees cars and coffee about 1-2 times a month and then beating on it at time attack. After a whole season…I have MAYBE a cap full or 2 in the can. That’s also at 8psi from a GT2871r on a B18c1…no idea what it makes at that boost level