The engine revolution (rpm) is not constant since I bought it. Not only it can be heard, but it can be seen in the dashboard that the engine is turning between 500 and 600 rpm. But the more frustrating, is that the Technical Adviser and the Director of the car dealer, Marlin from Quebec City, first both told me, over the phone, that they were hearing nothing. After challenging them, face to face, they change a bit their version, saying that this engine is working in a normal way. They are not of good faith since when I closed the discussion simply asking for a Yes or No to the question "is the engine revolution constant", they both said yes! Did you ever lived the same situation?