Since Mercedes paint is in normally nice condition, I would use a finishing polish (Poorboys 1.0 SSR or Pinnacles XMT 1 ) as possible and then coat with a sealant or carnuaba. Souveran paste rocks, and you will find no better. That said it is nowhere near as durable (long lasting) as a sealant like Wolfgang or Poorboys EX-P. Here is a note:
sealants --- reflective, glossy, durable
carnuaba waxes --- depth, warmness, wetness
If you choose a sealant then consider Quikshine from Clearkote for weekly cleanups and sprucing after washes, and if a carnuaba is chosen you could use either Quikshine or the ever popular Crystal Mist from Pinnacle.