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The 2008 BMW 335i requires Blue 50/50 antifreeze. If not used, the engine may encounter various issues such as a loose gasket that must be tightened promptly, potential oil leaks that should be addressed immediately, and spark plugs that may come loose, causing engine disturbances. A critical concern is engine overheating, which can lead to car fires and even explosions. To prevent problems, it is essential to promptly change the oil to avoid excessive use, replace the air filter every 15,000 to 30,000 miles, change the coolant every 60,000 miles, and replace spark plugs approximately every 100,000 miles unless using copper plugs, which need replacement every 30,000 miles or so.
In European-made cars like the 2008 BMW 335i, blue coolant is the type of coolant used.