Couldn't agree more with you, yal.
We took the car for a cruise last night and made 2 more observations in the "to-do" notepad.
1. To check the engine combusion.
The engine was last overhauled with pistons and valves change and grind last year. But somehow, carbon still accumalates. Rapid acceleration would blow those carbon away, and after a few successions of acceleration, the carbon built-up is minimal. I only notice this "habit" of carbon building in the W124 260E and wonder if any one else might have a similar "habit".
It defintely requires a good tune-up with the new injectors. The idling has gone way up to 1.1, and thus the engine rev is a little noisy and burning excessive fuel ...
126 tailed by a 203, 129 leading the pack.