MoparPartsGiant.com offers the wholesale prices for genuine 1988 Dodge Grand Caravan parts. Parts like Oil Cooler are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.5L, 6 Cyl 3.0L. Transmission: 5-Speed Manual Transmission, Automatic Transmission.