Bmw Coolant Oil

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. Some member suggested that I should.

The other day the low coolant light came on and when I looked in the expansion tank the coolant was an oily/off white color. My first thought was the head gasket however the engine oil is at the proper level and color (no coolant mixing). Yet another n55 oil in coolant thread.

All times are GMT. Genuine BMW Antifreeze/Coolant Part # 82141467704 Concentrated Dilution Required Contains no nitrates or phosphates, reducing harmful deposit formation. Bittering Agent Added.

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. I would get the oil filter housing gasket check before jumping to. 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. BMW Fluids Accept no substitute - Genuine BMW Fluids are developed, tested, and approved for the high-performance components of your Ultimate Driving Machine. Shop our full line of Genuine BMW Fluids - including Engine Oil, Antifreeze/Coolant, Power Steering Fluids, Brake Fluid, Transmission Fluids and more!

HELP! Oil in coolant system and dealer won't fix! HELP! Oil in coolant system and dealer won't fix! I wonder, what is the effect of the oil contamination in the coolant in the Electric Coolant Pump with its notoriously fragile Graphitar journal bearings? Since you're going to flush and refill the coolant system, I suggest vacuum filling as BMW recommends for ALL engines.