NTC2928 - Oil Cooler Return PipeDescription: Oil Cooler Return Pipe for the engine oil cooling system of the Defender, carrying cooled oil from the oil cooler back to the engine. This pipe is the return leg of the early oil cooler circuit, fitted to 90" and 110" models with the 2. 5 litre Turbo Diesel (non TDi) and 4 cylinder petrol and naturally aspirated diesel engines. It uses an imperial conical compression fitting, not interchangeable with the later metric o ring type fittings.