Done a bit more digging and i'm now thinking it's not the ledges, mainly as I'm getting no error codes, vanos solenoids we spotless, and with the engine running if I take the oil filler cap off and put my ear over the filler I can't hear anything abnormal, there is defiantley a tap coming from somewhere though, I'm chainging a oil drain gasket on my rear turbo on sunday so I'll give it all a good going over from underneath.
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2007 E92 335i, JB4 + custom back end flash, DCI, Downpipes, FMIC, Silicone inlets, Pure Stage 2 High Flow Turbos, Spec Stage 3+ Clutch and Single Mass Flywheel,
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