Just for info and yes wandering off topic for a minute re Porsche engines. The original service schedule on the 996 model (the first watercooled) was change the oil every 2 years!🤣 Long since proven to be bad advice! Even Porsche admits that. Oil and filter every year at an absolute max interval, even if only covering low mileages. Oils recommended by the manufacturer 20+ year ago are not necessarily the best for engines when they get older with higher mileages. So I guess similiar applies to the Rover V8.
