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1973-1978 Mercury Marquis Dual-Pass 15" Transmission Fluid Cooler Trans Oil Cooling, Brougham, Colony Park, Marquis, Grand Marquisl Series 621-O make-oldsmobile-model-series-22-year-1911Get that Oil Cool and Flow Clean Fluid Through Those Transmission Lines to your Radiator without worry about excessive Heat being your Transmissions worst enemy. Zirgo Transmission & Fluid Coolers Prevent Your Engine Oil and Transmission Fluids From Reaching Their Limits. At high temperatures, engine fluids can create a varnish on critical engine and transmission components, harden seals, cause transmission plates to slip, and cause transmission