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Hello. Sorry for my English, maybe there will be some mistakes.
So I have bought passat B7 2011
2.0 tdi engine CFFB and it is on DSG. Driven 250k km
The problem appears when you are driving cold engine.
If I start engine after it is tottally cold it starts and ideling nice. But if I start to drive within 1-15 minutes it makes terrible sounds (like from the dead rocker/hydraulic valve tappet) from engine bay and there is loss of power. But if you countinue to drive the sound is becoming more quiet and than it disapiers and also there is no power loss. For now i have changed only oil and filter, but nothing have been changed.
 
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