Check your Air Oil Separator (AOS). While the motor is running (and warmed-up) remove the oil fill cap... Is the cap hard to remove? Does the oil fill tube sound like a shop vac and the motor almost die? If you have these symptoms then the AOS is bad. If you remove the oil fill cap and the the motor RPM's stay the same or increase a little then AOS is probably OK.
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Jäger
300K Mile Club
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