Bmw Oil Mixing With Coolant

How does the engine oil look? If it's a leak within an engine oil/coolant barrier, depending on where, and which system, the higher pressure system leaks into the lower pressure system. I've heard that mixing coolants could create weird sludges as does adding stop leak but it's usually darker in color. Consider a flush and monitor.

The oil filter housing gasket on these cars is a known failure point. The oil filter housing also contains an oil cooling passage for the coolant. When this gasket fails it can sometimes allow oil and coolant to contaminate each other.

N52 are not known for blown head gaskets unless they are utterly abused by their prior owners. BMW 330d F31 2013 Mixing oil with Coolant Please HELPhi i have tried to show you in pics of the suspected culprit. now as i have mentioned in my other thread 1 of the coolant pipe was crack from near radiator and then i have replaced it with new one from BMW few of the mechanics have advised that it could be oil cooler in my case its 2 heat exchanges (oil coolers) fitted on my BMW 330d f31.

Oil filter housing gasket is leaking engine oil into cooling system. Flush the system with water and dawn (let engine get hot) then just water then coolant/water Mixed. BMW dealer suggested it was AT oil leaking into the coolant via the AT oil cooler (at the base of the expansion tank).

FYI, quoted repairs from the BMW dealer included changing the radiator, both hoses, water pump, thermostat, AT cooler, and doing a coolant flush and fill and an oil/filter change, for $4,300. However, I really appreciate your explanation of how the oil/coolant mixing occurs. It makes a lot more sense because I just didn't understand how there was clean coolant accumulated in the piston and the engine cooling passages but only the oil was mixed.

Made me wonder why there wasn't any oil in the coolant system itself. I lost a good 2-3 quarts of oil into the coolant system. I had milkshake for days in the cooling system but not a drop of coolant/milkshake in the engine fortunately.

Yet another n55 oil in coolant thread. All times are GMT. I'm seeking some help and advice from other members and properly diagnose oil found in coolant.

It all started out with leaking coolant from water pump which is fixed recently but I'm still seeing more and more milky brown layer of oil in my expansion tank. why is oil mixing with coolant in coolant tank Asked by jimtighe Feb 18, 2014 at 05:05 PM about the 2006 BMW 3 Series 320d Question type: Maintenance & Repair 2006 bmw 320 msport.