While I would agree with TWR that it is likely that the oil was deposited when the vehicle was turned around, before spending money on cleaning the engine – I would recommend you take a close inspection to see if you can locate the leak.
I’m not familiar with this vehicle, but even a VW of that vintage is likely to have an engine floor pan made of a fibrous flexible material (under the engine), making this difficult – with the oil leaking on to the floor pan, and then on to the ground.
But knowing that the most likely places for an oil leak are where gaskets have been fitted – and that gravity will result in any leaking oil heading towards the ground, may help.
Look closely all around the rocker box cover/head join, the join of the engine head to the block, the sump to the engine, gearbox/engine and don’t forget the oil filter and drain plug. Besides visual inspection, run your finger over suspect areas to check for oil.