The OPC will use 0-40 Mobil 1 in anything from a 10k miler to a 200k miler
There is a TSB from Porsche that says you can use 0-40, 5-40 or 10-40.
In cars that have some miles on them, oil will run along the bores into the combustion chamber when parked at certain angles when using using 0-40.
10-40 is the same when hot but thicker when cool and it prevents the shameful belch of smoke on start up.
People flounce over an oil debate on the Porsche forum