Even though your current car BJ5P hasnt got the look to be called a new car, you really dont have to worry unless you have not been attending rapairs or not try your best to keep the car in its best condition. Believing that you've been attending every possible thing still you know how good it is
So, just dont get deceived by the term new and the looks as you know every car is old even by a day so I would suggest you to keep on maximising the fixed deposit whilst attending the running repairs of the current car.
And please note that current car market is not stable at all therefore dont think of the car market as a relatively safe investment ✌✌