This is a Technical Journal: A whining or rattling sound may appear when revving up the engine. ( see attached sample files ). The sound may come from the balance shaft which is fitted in the oil sump area where the noise is most concentrated. A new design of the balance shaft is planned to be introduced 2018-Q2. Replace the balance shaft according the instructions in VIDA. Note: It's extremely important to adjust the new balance shaft with the correct tools according the instructions otherwise the sound may occur again in a short mileage.
