15W40 - 15W40 Oil - 15W40 Engine Oil - 15W40 Car Engine Oil - !5W40 Engine Lubricate Oil

15W40 refers to the SAE class according to which the engine oil was classified. The SAE class describes the viscosity of an oil, i.e. its flow properties as a function of the operating temperature. Engine oils of class 15W40 are multigrade oils. These have good flow properties at cold and warm temperatures. This means that the important lubrication points in the engine are optimally supplied at cold and heat. “15W” refers to the flowability at cold temperatures (W=winter). It is still pumpable down to -25 °C, i.e. liquid enough to disperse in the engine. The number “40” describes the flowability of the engine oil at an operating temperature of 100 °C. The kinematic viscosity of a 15W40 oil at 100 °C is in the range of 12.5 – 16.2 mm²/s.

Engine oils with SAE Class 15W40 function in the temperature range from -25 °C to +40 °C. In extremely harsh winters it can lead to inadequate lubrication with 15W40 oils.