However, in general, a 1994 Dodge Colt likely used a conventional 10W-30 oil. However, the owner's manual will specify the weight and type (conventional, synthetic blend, or full synthetic) of oil recommended by the manufacturer. It might also specify the API certification (like SJ or SL, though those are older standards, newer ones are now used).
Do not rely on online information alone. Using the wrong oil can seriously damage your engine. Always consult your owner's manual for the correct specifications. If you can't find your owner's manual, you can often find a digital version online through the Dodge/Chrysler website or a parts site by entering your vehicle's VIN number.