OER Parts offers a wide selection of Oil System & Parts for your 1973 GMC K15/K1500 Suburban. OER Parts offers 1973 GMC K15/K1500 Suburban Bypass Valves, 1973 GMC K15/K1500 Suburban Dipsticks and Tubes, 1973 GMC K15/K1500 Suburban Filter Adapters, 1973 GMC K15/K1500 Suburban Oil Coolers, 1973 GMC K15/K1500 Suburban Oil Filters, 1973 GMC K15/K1500 Suburban Oil Pan Baffles, 1973 GMC K15/K1500 Suburban Oil Pans, 1973 GMC K15/K1500 Suburban Oil Pickup Tubes, 1973 GMC K15/K1500 Suburban Oil Pumps, and 1973 GMC K15/K1500 Suburban Oil Senders.