What Causes High Oil Temperature in BMW?
2 Answers
Reasons for high oil temperature in BMW: Transmission oil level too high or too low: Check the oil level in the transmission oil pan and adjust the transmission oil to the specified level. Damage to the transmission pump or poor oil suction line flow: The function of the transmission pump is to control the high-pressure oil generated by the torque converter and distribute it to the second shaft assembly through the transmission distribution valve to achieve the forward and reverse movement of the loader. Damage to the transmission pump can result in poor oil supply to the transmission. As the loader's usage time increases, wear intensifies, leading to internal leakage in the transmission pump, causing the transmission pressure and mechanical efficiency to fall short of requirements. This results in poor oil supply in the suction line, preventing the oil from lubricating the moving parts and increasing friction, which can also cause system overheating. It is important to note that air leaks or blockages in the transmission pump suction line can also lead to insufficient flow, resulting in excessively high oil temperature. Deterioration of hydraulic transmission oil: If the hydraulic transmission oil in the transmission deteriorates, it fails to provide lubrication, leading to excessive wear in the system and high temperatures in internal components. It is recommended that users replace the hydraulic transmission oil every 1,500 hours of loader operation.
When the oil temperature in my BMW gets high while driving, I get quite worried. It's usually a problem with the cooling system. For example, insufficient coolant or a stuck thermostat can lead to poor heat dissipation. Last time I was on a long drive and the oil temperature spiked, I found that the radiator was clogged with dust, affecting heat exchange. The engine oil itself might also be old or insufficient—using the wrong grade or oil leaks are common issues. Internal engine wear, like a leaking head gasket, can allow hot gases to enter the oil passages. Driving habits also play a role—frequent hard acceleration or heavy loads can worsen overheating. I suggest pulling over first to check fluid levels and whether the fan is running—safety comes first to avoid serious engine damage. Regular maintenance, like cleaning the radiator, can help prevent this.
