OER Parts offers a wide selection of Oil System & Parts for your 1978 GMC Caballero. OER Parts offers 1978 GMC Caballero Bypass Valves, 1978 GMC Caballero Dipsticks and Tubes, 1978 GMC Caballero Filter Adapters, 1978 GMC Caballero Oil Coolers, 1978 GMC Caballero Oil Filters, 1978 GMC Caballero Oil Pan Baffles, 1978 GMC Caballero Oil Pans, 1978 GMC Caballero Oil Pickup Tubes, 1978 GMC Caballero Oil Pumps, and 1978 GMC Caballero Oil Senders.