The letter "W" in the SAE designation indicates the suitability of the oil grade for winter use.
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Universal (all-season) oil (BMW 5 Series E34)
BMW engines must use all-season oil. All-season oils have the advantage of working in a wide temperature range (summer/winter). The basis of all-season oil is a grade of liquid oil (for example, 15W). Thanks to the so-called thickener, the oil is stabilized in a hot state, thus maintaining its lubricating properties under any operating conditions. When using all-season oils, modern grades with a wide temperature range of viscosity should be selected (for example, 15 W-40, 15W-50).
The letter "W" in the SAE designation indicates the suitability of the oil grade for winter use.
The letter "W" in the SAE designation indicates the suitability of the oil grade for winter use.
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