OER Parts offers a wide selection of Oil System & Parts for your 1974 Buick Estate Wagon. OER Parts offers 1974 Buick Estate Wagon Bypass Valves, 1974 Buick Estate Wagon Dipsticks and Tubes, 1974 Buick Estate Wagon Filter Adapters, 1974 Buick Estate Wagon Oil Coolers, 1974 Buick Estate Wagon Oil Filters, 1974 Buick Estate Wagon Oil Pan Baffles, 1974 Buick Estate Wagon Oil Pans, 1974 Buick Estate Wagon Oil Pickup Tubes, 1974 Buick Estate Wagon Oil Pumps, and 1974 Buick Estate Wagon Oil Senders.