eventhorizon said:Which oil should I have analyzed? I am assuming you are talking about the engine oil, not the oil from the turbo units.
The engine oil should be analyzed, as that is the topic of your thread, and contains 'metal flakes' - the aerochargers should be rebuilt, and serviced regularly afterwards - certainly, at a minimum, the one aerocharger that has been driving around with its oil fill cap exposed should be given a close once over, and the fill cap should be replaced... the oil should be changed in both units as well.