Aside from the '93 octane, I always make sure I use only M-B approved grease in my muffler bearings as well. It's pretty expensive, but it really DOES make a difference.

__________________
"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles