Originally Posted by Zeus

1st Benz - you don't want to end up in my shoes (read my M113 post about oil consumption and sludge). I would change the oil more often, especially in a high performance V8.

My $0.02 is that the FSS intervals are too long, even with synthetic. Also depends how you drive - city (stop and go) or highway cruising commuting.

You have an E55? I'd put in nothing but the best, a true Group IV (PAO) synthetic. Make sure the oil bottle specifies MB 229.3 or better, 229.51. Mobil 1 0W40, Elf Solaris, Castrol Syntec 0W30 (has to be the German Castrol, dubbed 'GC', read back of bottle should say 'Made in Germany').

I would also recommend doing an interim oil change in between FSS service intervals.

Use the fleece filter.

Good luck with the sludge. My lifters are noisy as well.