All-season oils must be used for BMW car engines. This has the advantage that the oil does not have to be changed at the start of the new season (summer Winter). All-weather oils are produced on the basis of low-viscosity seasonal oil (e.g. 10W). Thanks to the so-called thickener, the oil is stabilized when hot, so that the required lubricity is achieved in each operating mode.
You can also use low friction (energy saving) oils. Low-friction oils are multi-grade oils, which, among other additives, contain friction modifier additives, due to which friction in engine components is reduced. The base oil for low friction oils is synthetic oil. The information on the packaging that the oil is mineral, semi-synthetic or synthetic indicates only the composition of the base oil. When mixing base oil with additives, engine oils with completely different qualities can be obtained.