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Unleaded Petrol
Going back to the days when unleaded petrol was first introduced, why couldn't certain cars run on unleaded.
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For more on marking an answer as the "Best Answer", please visit our FAQ.Earlier car engines needed lead in the petrol to help protect the cylinder head valves and seats from erosion and/or pitting. However, when catalysts came along to help clean up exhaust gases the lead had to be removed in order to protect the catalyst matrix. The lead would render the catalyst useless fairly quickly.