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for lubricants, Mercedes recommends Mobil 1 but any high performance synthetic would be great, Royal Purple for example.
Being a later model vehicle with computers managing things, it is difficult to get into circuits like the A/C clutch without risking back-feeding the computer and causing some otherwise strange results. I am sure it can be done, by looking through the schematic and then carefully measuring and understanding where to go into the circuit. You might consider placing a relay in the circuit so it is normally closed when not on the brakes and then opens when the brakes are applied thus not impacting the A/C system circuitry otherwise would be one idea.
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