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Hi, how much oil did you add to the motor?
If you added too much it could sound this way. You should only have added 1 quart of oil.
If you only added 1 liter or 1 quart you should have the oil level checked. If the oil is overfull it will need to be drained and refilled to the proper level.
Hi, I'm just following up with you on the Mercedes. Do you need anymore help with this?