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get the oil pleasure measured, has the relief valve stuck open, id expect a code have you checked for codes ? What's the air filter/inlet system like ? any blockages ?
 

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The oil pump relief valve it stops the pump over pressuring the system, you might be able to check the oil pressure
via the OBD socket.
 

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Air filter ok ?
 

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"Yeah it's the BMW Performance/K&N one but dry. That said it was on the car before I got it 2 years ago. So god knows how old it is".......... so if you don't know the age how do you know its not restricting the air into the engine....the engine will then sucking more CCV gasses in.
 
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