The oil-to-water heat exchanger is connected to both the oil circuit as well as the water circuit of the engine. This arrangement ensures the engine oil is heated faster by the coolant when the engine is cold and is effectively cooled by the coolant when the engine is at operating temperature.
Shortening the warm-up phase greatly contributes to reducing fuel consumption.
Oil filter with oil-to-water heat exchanger M57 E38/E39
• Mounted directly on the engine block
• The water for the oil-to-water heat exchanger is supplied directly from the engine block (crankcase)
• In the same way as on the M47, the water outlet is located on the oil-to-water heat exchanger
Oil filter with oil-to-water heat exchanger M67 E38
• Mounted directly in V-area of cylinder block
• Oil-to-water heat exchanger located in water bath of V-area
