BMW F10 engine warms up slowly
F10 diesel warms up slowly in freezing weather – what is wrong?
The most common cause is a main thermostat stuck open. After replacing it, temperatures normally rise to about 90 degrees. If temperatures are still low, also check the thermostats on the filter housing, which control the heating and cooling of the gearbox oil.
How long should the engine take to warm up in freezing weather?
A short trip is not enough in freezing weather. The coolant may reach about 90 degrees only after fifteen minutes or even longer driving, and the oil always warms up more slowly than the coolant. The B47 produces less waste heat than the N47, so it is colder in winter.
What does the oil temperature in the instrument cluster tell?
The cluster's temperature display is a calculated value that tells you the engine is at operating temperature. It is not the actual oil temperature. The actual readings can be seen in the hidden menu, and from them you can also tell whether the sensor or the car is cold.
When is the temperature normal and when not?
In a pressurised system the coolant is normally over 100 degrees, and the shutters are open at about 108 degrees. An oil temperature of 120 degrees is a reason to worry. If the coolant stays steadily at 60–70 degrees, check the thermostat.