Looking at a few 1.6L NA's and drove one today, the car drove great but I noticed that in 1-3rd gear there was a bit of whining noise while the car was in gear and accelerating. Seemed that in 4th or 5th cruising at a constant speed it was gone. Shifting itself was fine and nothing seemed to out of the ordinary, is this a typical problem? Could changing the tranny/diff fluid out make a difference?