Vacuuming my matchbox cars aside, here is some relevant information.
In response to the quote I'd like to point out that this is largely dependant upon ring gap and cylinder pressure. As a general statement, I agree entirely.
In a street car that spends a long time at normal operating temp and stoich mixtures, we will see that raw fuel and water has a chance to evaporate from the oil.
Conversely when we have larger ring gaps (in a piston engine), an afr that is nearly a quarter fuel and is only run for a couple of minutes at a time, there is no possibility that fuel or water can disappate sufficiently to allow the oil to provide sufficient protection in long term use cases.
When we start to veer away from oem design, the need for oem servicing changes.