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Best way to remove sludge from engine.

Water seems to have gotten into the oil of my wife's '98 VW Jetta.It apparently got in through the broken dipstick tube (thank's Jiffylube).The result is a light colored pasty mess on the inside of the valve cover and most likely everywhere else.What is the best way to clean this sludge from the engine? I understand flushing it with a solvent based product can possibly cause problems.Could repeated oil changes, say at 500 miles thoroughly clean the mess out of there?


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