Dodge Colt/Challenger/Conquest/Vista 1971-1989 Repair Guide

Fuel and Oil Recommendations


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Fig. Fig. 1 Oil viscosity chart

Early 1970s vehicles will operate on regular, low lead gasoline of 91 octane; later models and all models equipped with a catalytic converter MUST use unleaded gasoline. Regular unleaded gasoline is usually satisfactory, although using a higher octane may enhance vehicle performance.

Oil must be selected with regard to the anticipated temperatures during the period before the next oil change. Using the chart, select the oil viscosity for the lowest expected temperature and you will be assured of easy cold starting and sufficient engine protection. The oil you pour into your engine should have the designation SF marked on the top of its container.