[GraemeB]

I live in Spain and Scotland. When I return to Scotland for a few weeks the Porsche oil level rises. When I return and drive in Spain the oil level starts to drop..and drop...and drop. The engine runs perfectly.
Very worrying to me and I don't drive far. There are no drops on the garage floor and no smoke from the exhaust. I suspect the oil is still in the engine and that the engine needs cleaning inside. Has anybody got experience of this? What should I do?