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N55 Engine
Cooling System
The cooling system of the N55 is enhanced with additional oil cooling.
Two different types of oil cooling systems are used depending on the model and applica-
tion. In the “hot climate” version, heat transfer from the engine oil to the engine coolant is
avoided by separating the oil cooler from the engine coolant circuit. The other version
uses an auxiliary radiator in combination with an oil to coolant heat exchanger bolted to
the oil filter housing. The auxiliary radiator enhances cooling efficiency by adding surface
area to the cooling system.
N55, cooling system
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