RC,
if you have a chance, go through the "Gredinger Kurven",coming from Nuernberg towards Munich and you will find out, how good your E 55 handles and if the oil light is coming on again. At low or no traffic you should be able with modern cars like yours, go through without lifting the throttle with about 270 - 280 km/h. In the old days, I was able to do 250/260 km in a good set-up 911 Turbo or Widebody Cab.
Let us know.