IIRC from earlier postings, the bore surface of the V12 is hypereutectic aluminum, no coating. This means the aluminum has around 25% silicon in the alloy, which leaves the alloy matrix rich in hard, primary silicon particles. The bore surface is chemically polished to make the primary silicon stand proud from the softer aluminum matrix. This leaves little nooks and crannies to act as minireservoirs for oil to lubricate the bore - just like cast iron bore surfaces are designed to hold oil - and the primary silicon provides the wear surface, which is essentially wear-proof.

It is reported that this hypereutectic aluminum - with proper oil maintenance - can run 500K and show virtually no wear. It is also not serviceable should something happen to the bore. Hypereutectic silicon is a bear to machine.

So, to answer your question - except for inspection, I suspect you'll have to do nothing to the cylinder walls.

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95 E320 Cabriolet, 169K