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That a 1999 European vehicle would be built to require leaded fuel is just wildly improbable, so the suggested diagnosis isn't making sense. Tell us more or look for another source for your troubles Knocking is caused by the fuel having a too low octane rating rather than the fuel being unleaded, although lead does act as a good octane booster. Light or moderate cases of knocking will usually resolve themselves when you switch to a fuel of the correct octane rating. Severe cases of knocking can knock pieces out of the pistons, which of course won't go away w/o an engine rebuild. Running unleaded fuel (of the correct octane rating) in an engine not built for it will usually eventually damage the valve seats, and will require a cylinder head rebuild to fix.

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Q: Can you reverse the knocking effects from unleaded gasoline on a 1999 ML 320 Mercedes?
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