8bender, I just checked my PMs - (that's Private Messages.) I had a treasure trove of experiences and advice from JimB the forum member that passed away last Spring or so of 2015. I no longer have those messages, or I'd of Fwd. them to your PM Inbox. As I wrote - there's members here that can point you in the direction of JimB's experiences he related with his 560SEC over the many years here. I'm sure some will pick up on your thread here and point you in the right direction(s). They are really fabulous cars, and I still have a passing interest in perhaps procuring one for myself someday.

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'06 E320 CDI
'17 Corvette Stingray Vert