Synthetic oil or just a high grade everyday oil?
The advantage of synthetic oil is that it does not lose viscosity or break down under high heat conditions, as do standard oils. Porsche and other perfomance auto manufacturers recommend synthetic in their vehicles but with higher intervals between oil changes. (10,000 miles). Flitration seems to be the only limiting factor. Personally, I use synthetic with a high grade/heavy duty filter. After all we've invested considerable amounts of money in our Rialtas, we want them to last as long as possible! Consider it a small investment to avoid costly repairs.