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I'm hearing the same noise from my car about 50%of the time
but the noise is lot less apparent after i made the switch to 0w40
have you thought about maybe noise is coming from second chain
linked to the oil pump? upper chain guide is held by tensioner, idk
if tension is created by oil pressure or just spring by it self.
its just a theory but i think its worth checkin before going into
vanos gears.
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