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The BMW m140i uses either green or blue coolant, and it's important to watch out for engine problems. Keep an eye out for spark plugs coming loose, as this can cause issues. If a gasket is loose, it should be tightened promptly. One critical issue to watch for is the engine overheating, which could potentially lead to serious consequences like fires or explosions. Additionally, be aware of excessive oil consumption, and be prepared to change the oil as needed. Replace your air filter every 15,000 to 30,000 miles, and change the coolant every 60,000 miles. Spark plugs typically need to be replaced every 100,000 miles, unless they are copper ones that should be changed every 30,000 miles.
The German cars like the bmw m140i employ blue coolant in their systems.