Owner's Manual
Page 202
...with a lower octane rating can cause persistent and heavy knocking, which can damage the engine. Common oxygenates are designed to improve air quality. If your vehicle. 205 Servicing Your Contour Typical octane rating label Using a fuel with cosolvents and additives), and MTBE or methyl tertiary butyl... ether (blended at no more than 15%). Do not be caused by fuel with starting, rough idle or hesitation problems when the engine is...
...with a lower octane rating can cause persistent and heavy knocking, which can damage the engine. Common oxygenates are designed to improve air quality. If your vehicle. 205 Servicing Your Contour Typical octane rating label Using a fuel with cosolvents and additives), and MTBE or methyl tertiary butyl... ether (blended at no more than 15%). Do not be caused by fuel with starting, rough idle or hesitation problems when the engine is...