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What Causes the Oil Temperature of BMW 525 to Reach 120 Degrees?

2 Answers

LaSilas

07/24/25 8:15pm

Here are the specific reasons why the oil temperature of the BMW 5 Series exceeds 120 degrees: 1. Improper Oil Level: Insufficient oil volume or excessively high oil level can lead to excessively high oil temperature. A malfunctioning oil pump or insufficient oil pumping can easily result in inadequate oil pressure and poor heat dissipation. 2. Excessive Cooling Water Temperature of the Diesel Engine: Failure to promptly cool components and remove heat can cause the temperature of heated parts to rise, leading to an increase in oil temperature. 3. Clogged Oil Cooler: Insufficient oil pressure and failure to achieve normal heat dissipation can more easily lead to excessively high oil temperature. 4. Clogged Oil Filter: Oil directly enters the main oil passage through the bypass valve, causing impurities in the oil and exacerbating engine wear. 5. Poor Piston Ring Sealing: Cylinder leakage increases the ventilation volume of the crankcase, causing oil to be expelled with the ventilation and leading to excessively high oil temperature.

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DelIsaac

08/11/25 11:04am

I noticed the oil temperature suddenly rose to 120°C while driving my BMW 525, which is quite common and needs immediate attention. Normal oil temperature should be maintained between 90-110°C, 120°C is too high and poses significant risks. The sensor might be aging, displaying inaccurate readings—especially in older cars where electronic components tend to fail. Alternatively, the oil passages could be clogged, with debris accumulating in the oil cooling system, leading to poor heat dissipation. Last time I was driving on the highway, hot weather combined with prolonged high engine load caused the oil temperature to spike. Don’t forget to check the oil level—low oil means poor lubrication and faster temperature rise; use the dipstick to confirm. Running the engine like this long-term will cause premature wear, and repairing damaged piston rings or cylinder walls can be extremely costly. I recommend regular maintenance, including changing to high-quality oil every 5,000 km and cleaning the oil cooler to prevent issues proactively.

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