i know a lot of 2l 8v mk4 engines have this problem, cant say i recall the 1.6 doing it, but probably the same reason.
apparently there was a seal installed upside down when the motors were built. lots about it on vwvortex. if cars were found to have it during warranty they had the engines rebuilt, but it was never a recall as far as im aware.
my car is the same, i doubt i could go 15,000km without it using ALL the oil. i have been caught out once or twice earlier on with it basically emptying the engine of oil and getting a 'stop engine' alarm when cornering hard (moving remaining oil to one side of engine, away from the sensor).
these days i just keep track of it and give it a top up every 7,500km (half way between the 15,000 scheduled services)
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