Discussion
From a Porsche technical bulletin:
Miscibility
The engine oils approved by Porsche can be mixed to the extent that it is not necessary to flush the
engine when the oil is changed, or another type of oil is used. This holds true for mineral oils and syn-
thetic oils.
However, since every brand of oil has a specially adapted unique composition, the same oil should be
used for any topping up that might become necessary between oil change intervals, whenever possi-
ble.
I've no idea how true that may be, just stating what it says.
Miscibility
The engine oils approved by Porsche can be mixed to the extent that it is not necessary to flush the
engine when the oil is changed, or another type of oil is used. This holds true for mineral oils and syn-
thetic oils.
However, since every brand of oil has a specially adapted unique composition, the same oil should be
used for any topping up that might become necessary between oil change intervals, whenever possi-
ble.
I've no idea how true that may be, just stating what it says.
I spoke to the technical department at Castrol a couple of years ago, as I was worried about mixing synthetic with semi synth or mineral.
They told me that by LAW all oils have to be compatible. That doesn't mean to say it's recommended you mix them, just that they can be without a problem.
They told me that by LAW all oils have to be compatible. That doesn't mean to say it's recommended you mix them, just that they can be without a problem.
Gassing Station | Porsche General | Top of Page | What's New | My Stuff