Even your BMW owner's manuals recommend an oil change every 15,000 miles. And on most BMW cars, the reminder lights on the instrument panel are set to remind the driver to change their oil at this time, too.
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What happens if you put 5W20 instead of 0W20?
0W20 vs 5W20 Fuel Economy
Both 0W20 and 5W20 are low viscosity and high-quality synthetic grades that can massively optimize fuel economy. Their properties are the same when used in fair-weather temperatures. Likewise, there is little to no difference between the two versions when used in cold conditions.
A 10W or 5W is the index for how easily the oil flows in winter (hence the W). A 10W oil thickens more than a 5W. The other number indicates the oil's resistance to thinning at high temperatures.8 mar 2015
A 30 grade oil, thick enough to protect in the heat, was recommended for summer use. Then, multi-grade oils were formulated. A 10W-30 had the winter cold start flow properties of a 10W and the summer, high-temperature thickness of a 30 grade.