Quote:
Originally Posted by electricalserv x5
so what is causing that sludge ?is it not changing something else or it there another fluid go through the engine...........if it isn't the oil what is then?I don't have that problem and I had E53[4.6is,4.8is] for 9 years
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The problem is the very cold weather in some areas and bad CCV design. The mayo build up is condensation forming inside the CCV and crankcase. The engine is hot and since it's cold outside it will start to 'sweat' aka condensate and mix with the oil once the engine starts to cool down. Since the crankcase has nowhere to vent, it will just condensate every time you turn off the engine in very cold weather.