[RKDinOKC]

The motor needs to get hot enough for long enough that the heat boils/evaporates the water out of the oil. For every gallon of gas burned, 3 gallons of water is created. The main function of an oil filter is to remove water from the oil. That is why they hang down.

The 928 GTS crankcase vent system fogs quite a bit of oil into the intake which builds up a layer of carbon on top of the piston. The more the carbon build up, the higher the compression and the more ring blowby there is, which puts more oil down the intake. This oil passed to the intake also causes pre-detonation both because of the increased compression and the oil vapor in the combustion chamber thru the intake reduces the octane of the fuel charge. And the pre-detonation creates even more blow by.

That is why I am having the rings redone on my GTS. If the mechanic ever gets to it.