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The engine oil recommended for the BMW X5 e70 is 5w-40. It's crucial to use high-quality oil to ensure the engine operates smoothly. Over time, issues may arise with the oil, such as a strong burning smell, which should be addressed promptly to avoid potential hazards like engine damage or even an explosion. Low-quality oil can lead to engine failure, manifested by knocking noises and decreased fuel efficiency. It's important to schedule regular oil changes every 5,000 to 10,000 miles to maintain engine health and prevent any complications due to outdated oil.
I've been sticking to Mobil 1 full synthetic 15,000-mile protection 5W30 for my 2002 X5, which has 210,000 miles on it and is still running strong thanks to constant use of Mobil 1.
BMW suggests using synthetic 5W-40 oil for a 2013 BMW X5 E70.