OER Parts offers a wide selection of Oil System & Parts for your 1968 GMC All Models. OER Parts offers 1968 GMC All Models Bypass Valves, 1968 GMC All Models Dipsticks and Tubes, 1968 GMC All Models Filter Adapters, 1968 GMC All Models Oil Coolers, 1968 GMC All Models Oil Filters, 1968 GMC All Models Oil Pan Baffles, 1968 GMC All Models Oil Pans, 1968 GMC All Models Oil Pickup Tubes, 1968 GMC All Models Oil Pumps, and 1968 GMC All Models Oil Senders.