What you haven’t told me is whether your car has an automatic or manual transmission. And that means different things if the transmission has somehow been over-filled.

In the case of a manual gearbox, you’ll find that the extra oil will probably soon be evenly distributed across the bottom of your car as the excess exits the scene through either a breather tube or a seal or gasket.

But if it’s an automatic, the extra fluid could cause the entire transmission to behave strangely, as this type of gearbox relies on the correct internal fluid pressure to select gears, change gears and, in fact, make the car move at all. Again, though, the extra will probably force its way out through a seal or gasket and then you have a much more complicated repair to make.

The best advice is to check the level of the fluid as set out in the owner’s handbook and make sure the level is correct before driving anywhere else.

It sounds like the transmission has broken something internally. It could be that the clutch assembly is smashed, or the input or output shafts have snapped. It could even be the actual gearsets that have failed, leaving you with no mechanical connection between the engine and the gearbox.

Either way, it sounds like it needs a new clutch and/or gearbox which may be more than the market value of the car. That said, wrecking yards are full of Hyundai Getzes, so a second-hand, tested transmission might save the day.

It could be a single oil leak that is showing up in more than one place. The first place to check would be the rocker cover gasket which are prone to leaks (not just on Hyundais). If this has failed, oil could be leaking along the edge of the rocker cover and on to the gearbox, while the same leak could appear as though it’s coming from the spark plug socket (as well as a variety of other places).

The best way to find the location of an oil leak, is usually to clean the engine thoroughly, removing all the build-up oil, grease and dirt. Allow the engine to dry and then take the car for a drive. By continually checking the engine over the next few days you might be able to spot the source when the oil leak reappears.