Do you intend to rebuild this engine? I ask because MB has a special process for their aluminum bores. While I don't understand all of the nuances it is my understanding that the castings have a high silicon content. For the surface finish the aluminum is chemicaly etched leaving a predominately silicon surface for the rings to wear against. That is how Mercedes gets such an unusually long service life from such a soft material.

FWIW, when BMW first tried to build its aluminum V8, it failed miserably. I've seen those with 10K mi and completely worn out bores.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff