...with a '99 S420

There's a pristine '99 S420 with 120k for sale locally, they're asking 7 grant... Should I??? Will I be banned from the diesel forum?

Seriously, does anybody have experience with these? What should I look for?

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'99 S420, 155k
'91 VW Vanagon GL, 150k
'85 VW Vanagon GL, 120k
'82 VW Westy, aircooled, 165k