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Originally Posted by Scotty89
When I bought the car, the seal was leaking and later when I installed JB4 I realised that someone prior had installed and removed a JB4...
Do you think the added boost over stock + something like a malfunctioning PCV has caused the oil cooler gasket to leak again?
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Nope, the valve cover gasket, filter housing gasket, pan gasket, rear seal will leaks bc the crappy gaskets fail over time due to heat cycles. Has nothing to do with added boost or tuning. This is a fact of life with BMWs ( And many other manufacturers as well).