I wonder if Mobil 1 5w30 ESP would be good since it falls on the higher end of viscosity for a 5w30?Ha! That's what I've been trying to figure out. Based on my experience, no contemporary 5W-30 oils are up to the task. Most informed opinions seem to fall into 3 categories:
1) euro spec 0W-40
2) Diesel full synth, typically 5W-40 (Rotella T6)
3) 5W-30 with ZDDP additives
This only applies if you drive the car hard, i.e. engage "lift" and rev past 6,400RPM to redline. For normal driving, 5W30 is fine.
Sound like you have sweet ride in your garage! Pics please!