when the car is parked on uphill, and I try to move the gear back on to reverse, it becomes extremely difficult. Like you have to put a little effort into it. Once it gets into gear, it makes a loud thump noise....which I don't like. The handbrake pedal is depressed during this time. It was like this the day I bought the car brand new...but didn't think it was too serious. Does this mean I need to add gear oil?