Keeping your engine safe. Many of you who have fitted a larger turbo or simply increased the boost setting will have experienced an increase in blow-by, a phenomenon whereby misted oil is pumped out of the breathers and back through the engines induction system. Solving the problem is as simple as equipping your vehicle with a good looking polished aluminium oil breather/separator tank. AVO's oil breather system prevents oil from re-entering the intake system which greatly reduces the possibility of detonation.