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Solenoid Valves.... That fixed it for me...
Performed diagnostic fault survey and found a fault in the engine control unit(DME): 2A87 Exhaust vanos mechanism, not currently present, occurred 2 times.
Referenced SIB 11 02 08 and checked that the oil filter insert was installed.
Next step is to replace both vanos solenoids and change the oil and filter, clear faults and see if the fault returns. If the fault does return the exhaust cam will need to be removed and the cam ledgers inspected.
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