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Petrol-paraffin engine
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<p>A petrol-paraffin engine, TVO engine (United Kingdom) or gasoline-kerosene engine (<a href="/facts/North_America/djNjCQIl">North America</a>) is an old-fashioned type of <a href="/facts/Dual-fuel/fXetDJVV">dual-fuel</a> <a href="/facts/Internal_combustion_engine/Ju4BXzj0">internal combustion engine</a> with <a href="/facts/Spark-ignition_engine/NATGwWSj">spark-ignition</a>, designed to start on petrol (<a href="/facts/Gasoline/lcnxq5BS">gasoline</a>) and then to switch to run on paraffin (<a href="/facts/Kerosene/DoHPYXKp">kerosene</a>) once the engine is warm. The grade of paraffin used is known as <a href="/facts/Tractor_vaporising_oil/n2C5o5Mw">tractor vaporising oil</a> in the UK. </p>