I've been beginning to notice... as more stations here go ULSD that my overall engine sound is beginning to get quieter. I filled my tank yesterday, with all ULSD, and the engine had less clacking, and the general sound of the engine became duller sounding in a pleasant positive way....any chance it's from the ULSD? this over the span of about 2 or three weeks...

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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