Their viscosities are very close, and even more so if the manufacturer and their class are the same, then mixing these two types of oil is possible and even driving like this until the next change. Let’s take for example two most used engine oils, 5W30 and 5w40. But, the further operation depends on the difference between the oil you have in the engine and the added one. In this emergency situation, you can add up the only available oil option in the engine. To provide a better answer to the question of whether different types of oil viscosities can be mixed, we will say that this operation should be done as a last resort.Īnd by this I mean if you are stuck in a place where you have no other options to add an identical oil type and viscosity in your car, maybe when you’re on a trip, far away from a gas station or an automotive shop, or on a highway. In some documents, there is clear evidence written in the safety requirements of the possibility of mixing different oil viscosities in such a way that it does not cause any destructive consequences for the engine.Īll car oils have a certain standardization according to API (American standard) and ACEA (European standard) (read more here), and since the lubricating oil meets these standards, in this case, it does not matter which class, this requirement is met to have the possibility of mixing engine oils. However, this is not true for all engine oil types. This will not cause any negative impact, such as chemical reaction the crankcase, foaming, bubbling. All modern engine oils can be mixed whether if it’s fully synthetic, semi-synthetic, or mineral. The quick answer to this question is yes, you can mix different engine oil viscosities, but you have to consider certain factors when you do. ![]() What viscosity does a fully synthetic, semi-synthetic, and mineral engine oil has?Ĭan I mix different engine oil viscosities?.Can I mix different engine oil viscosities?.See API Base Oil Interchangeability Guidelines. For best results, blend base fluids from a base stock slate or fluids from the same manufacturer. ![]() Mixing Viscosities Calculator: To predict blend viscosity of two or more base oils or to predict mixing ratio of base oils to reach the desired viscosity. Dynamic To Kinematic Viscosity Calculator Density: g/cm3 Dynamic Viscosity: mPa.s Kinematic Viscosity: Enter Values and Click Calculate! Fill in the density Mixing Viscosity (Blending) Calculator Dynamic viscosity is a measure of force, while kinematic viscosity is a measure of velocity. In addition to this, one can calculate the oil viscosity at the operating temperature of Dynamic Viscosity and Kinematic Viscosity CalculatorĬonversion between dynamic and kinematic viscosity Two Calculators are provided for conversion between dynamic viscosity and kinematic viscosity. ![]() Standard Practice for Viscosity-Temperature Charts for Liquid Petroleum Products If you know the viscosity of a particular type of oil at two temperatures (like 40 and 100☌), it is possible to calculate it at a different temperature (ASTM D341). Viscosity-temperature Extrapolation (ASTM D341)
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