Originally Posted by Savannah Buzz

Not six liters in two days. That's almost an oil change. But who knows, surely by now it will have soaked up all it can. Oil leaks, like coolant leaks, are not always when parked. They can be dripped off and usually make spots or grime on the back hatch or bumper. Plus if you have brand new synthetic oil, it can be so colorless that it is hard to see even on the stick, and hard to see where a leak is around a gasket.

Or you could have an evil "friend" who is sneaking over to drain some each night.