Mercedes don't like fuel additives,but using seafoam thru a vac line works good.I sucked the whole can up and shut down the engine for 15 minutes,then drove the piss out of her until exhaust turn clear again.Then I changed spark plugs.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt