HPL cleaner in a BMW N52 3.0 liter. Not sludged, but typical crusty buildup from BMW dealer service for 125k miles. Crusty, hard, would not wipe off with a paper towel. I wanted to see how effective the cleaner is.
After just 500 miles. No wiping or cleaning except the rubber seal ring. Won't remove the valve cover for you because it isn't leaking.
Can also report the lifter tick totally gone after 100 miles.
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