OER Parts offers a wide selection of Oil System & Parts for your 1975 Buick Century. OER Parts offers 1975 Buick Century Bypass Valves, 1975 Buick Century Dipsticks and Tubes, 1975 Buick Century Filter Adapters, 1975 Buick Century Oil Coolers, 1975 Buick Century Oil Filters, 1975 Buick Century Oil Pan Baffles, 1975 Buick Century Oil Pans, 1975 Buick Century Oil Pickup Tubes, 1975 Buick Century Oil Pumps, and 1975 Buick Century Oil Senders.