The car of my girlfriend do it , it sould be the sound of the cranck shaft bearings running dry. Just after changing the oil put a good adittive together , like prolong , i use it in my GTR and in my car that got 248000Kms and never have to redone the motor , no burning smoke oil , just change now and then the timing belt. So that aditive keep all parts lubricated till the oil reach all parts of the motor , and that can take 1 or 2 seconds . Remember to put a grill to protect the radiator . Ride Safely : Pedro 
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