I have a '94 accord with an auto, and lately I think the shifts are less and less smooth. Should I make the switch to the Mobil Synthetic ATF, and does it matter if it's gonna be a mix, as you know you can only change like 3.2 litres at a time, and the total is something like 5 litre. So it should be about 60% synthetic, would that be okay? And well, should I make the switch, should I expect smoother shifts after going synthetic?