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. For best results, blend base fluids from a base stock slate or fluids from the same manufacturer. See API Base Oil Interchangeability Guidelines.

Mixing Viscosities: Oil Viscosity Calculators for the blend of 2-4 base oils.

Module #1: Oil Viscosity Calculator to predict blend (mixing) viscosity of two base oils.

Base Oils Blend Viscosity Calculator

Viscosity Calculator #1

 

To predict the mixing viscosity (blend) of two liquids or base oils:
1- Enter viscosity of the first base oil
2- Enter viscosity of the second base oil
3- Fill in the percentage (%) of the first oil in the blend.
3- Select the temperature for the viscosity measurements. Viscosity measurements must be at the same temperature for both oils.
4- Click Calculate button to predict the mixing viscosity of the two oil blends at the selected temperature.

Module #2: Calculator to predict mixing ratio to reach desired oil viscosity.

Viscosity Calculator #2


 

To get a percentage of each oil to reach a target viscosity by mixing or blending two base oils:
1- Fill viscosity of the first oil
2- Fill viscosity of the second oil.
3- Fill in the desired viscosity. Desired viscosity must be between the viscosity of first and second base oils.
4- Select the temperature for the viscosity measurements. Viscosity measurements must be at the same temperature for both oils
5- Click Calculate button to predict the mixing ratio of each base oil to reach the desired viscosity.

Module #3: Mixing viscosities calculator to blend or mix more than two base fluids.

Viscosity Calculator #3

Viscosity (cSt) Wt %

 

1- Fill the viscosity of Base oil #1 and weight percent (Wt%) in the third (Wt%) column.
2- Fill in the viscosity of Base Oil #2 and weight percent (Wt%) in the next column.
3- Fill in the weight percent (Wt%) and Base oil #3 viscosity in the 3rd row. If you don’t want to include 3rd and 4th base oils, fill any value (>1) in the viscosity cell and zero (0) in the Wt%.
4- Repeat the same for Base Oil #4 by filling in the viscosity and Wt% of the Base oil.
5- Click Calculate to predict the mixing viscosity of the blend.
Please note: Leave the default value of “1” in the viscosity field if blending less than two liquids. Fill in zero 0 (or leave default “0”) in Wt % if not included in the blending calculations.
6- The Sum of Wt% must be 100.

Viscosity temperature is not required but must be the same for all base oils viscosities.
You can use this calculator to predict mixing viscosities of 2-4 base oils. Fill in zero (0) in the weight percent column (Wt%) if Base oil #3 and-or Base oil #4 are not part of the mixing viscosities.

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5 Responses

  1. Your lab results are wrong. Mixing SN150 (5.13 cSt) and SN500 (10.9 cSt) will produce <9cSt viscosity. Mixing 10% of high viscosity oil (220+190 cSt) into this, will not bring 18 cSt. You are trying to make 20W-50 oil I guess. We use 10-12% of polymeric thickener or viscosity index improver with viscosity of 1500 cSt to reach 18cSt.

    You have to add 10-12% or more viscosity index improver with viscosity of 1500 cST or higher to reach 18 cST. Check your lab results.

    1. Yes U r right, we were making 20w 50. Usually we used SN 150 & 10% VI improver polymer to Make liquid VI improver, and my boss told me that liquid VI improver vis @100 is approx 220 cst. And 190 cst is the additive viscosity. Based on this we made…
      Oil 1 Vis @100: 5.13 with 23 %
      Oil 2 Vis @100: 10.9 with 67%
      Oil 3 Vis @100: 220 with 8%
      Oil 4 Vis @100: 190 with 2%
      Lab result was 18 cst @100.

  2. Used Calculator 3# My input was
    Oil 1 Vis @100: 5.13 with 23 %
    Oil 2 Vis @100: 10.9 with 67%
    Oil 3 Vis @100: 220 with 8%
    Oil 4 Vis @100: 190 with 2%

    As per calculator it was 10.9 cst @ 100. But practically it comes in laboratory 18 cst @100.

    Please help me out

  3. Great Calculation. Will be more helpful if I get the calculation for CALCLATOR # 3, in excel sheet. Thanks

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