After approximately 200 miles, the knocking got quite loud and now I have significant loss of power. Is that related or is that a different issue? I would have expected the engine to just quit and not to die slowly like this.

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