My 12 G37x is due for an oil change soon and I'm trying to decide between Mobil1 5w-30 Vanilla (what it's had for the past 50k miles I've owned it, 83k total on the car) and Mobil 1 5w-30 EP or the 0w-40FS, or maybe even Redline's 5w-30. No engine mods and the car sees a mix of shorter rural back road drives along with a few interstate road trips, no track or autocross. It has no leaks, no consumption or makeup oil, no problems with the original catalytic converters (knock on wood) and never throws codes. Should I just keep using what I'm using or are one of the other options going to make an appreciable difference in engine protection and longevity?