OER Parts offers a wide selection of Oil System & Parts for your 1976 GMC C25. OER Parts offers 1976 GMC C25 Bypass Valves, 1976 GMC C25 Dipsticks and Tubes, 1976 GMC C25 Filter Adapters, 1976 GMC C25 Oil Coolers, 1976 GMC C25 Oil Filters, 1976 GMC C25 Oil Pan Baffles, 1976 GMC C25 Oil Pans, 1976 GMC C25 Oil Pickup Tubes, 1976 GMC C25 Oil Pumps, and 1976 GMC C25 Oil Senders.