What type of oil does a 1993 dodge caravan use 1040 or 1030?

A 1993 Dodge Caravan doesn't use 10W-30 or 10W-40 oil based on a simple numerical designation. The weight is only part of the specification. The owner's manual for your specific 1993 Dodge Caravan will state the *correct* oil type and viscosity.

You need to consult your owner's manual or a reliable online resource that specifies the requirements based on the engine size (e.g., 2.5L, 3.0L, 3.3L) and any other relevant factors. The oil type might also specify if it needs to be a specific type, such as synthetic blend or conventional. Using the incorrect oil can damage your engine.