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I've recently just started reading this thread. Up to 140K KM now I still have this ticking or knocking sound off and on: around 2000-3000 RPM, light load, or going up hill slowing especially more prevalent with full tank of gas. I've used Castrol, Red Line, BMW dealer oil, and Voltronic all the sames sound doesnt go away. Had spark plugs replaced regualy, airfilter replace, rod barrings. Doesn't help....anyone have any new updates? Kind of annoying no one or the dealers can solve this.
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