MolaKule
Staff member
Quote:
Maybe "base" is what I'm not understanding correctly. Isn't the base oil the one which comprises the highest percentage of the recipe? I.E. In this case, the 40 to 50 percent Solvent Refined Heavy Paraffinic? From what I'm seeing on the web, that's a group I or, a group II at best.
https://bobistheoilguy.com/forums/threads/oil-rheology-ii-groff-charts.41181/
The answer is no to your main question. Base oils can refer to any one group-type of oil, or refer to combinations of base oils of various Groups and viscosities that make up a weight grade. However, I know of no one today who uses a single type of base oil for his formulation.
G-MAN and others are correct in that you cannot make a 20W50 from Group III BASE OIL ALONE. It takes a combination of base oils of various viscosities and VII's to make a specific weight grade.
There are literally hunfreds of combinations of various base oils and respective viscosities that can comprise any weight grade (viscosity or viscosity spread) of oil.
In our former 20W50 (alchy) Partial SYnthetic racing oils, we used base oils of PAO's, Esters, and Group II oils, with the Group II's as majority, PAO's as second percentages, and Esters as teriary base oils. The PAO was actually a mix of three different viscositties of various PAO's. We used no VII's.
Maybe "base" is what I'm not understanding correctly. Isn't the base oil the one which comprises the highest percentage of the recipe? I.E. In this case, the 40 to 50 percent Solvent Refined Heavy Paraffinic? From what I'm seeing on the web, that's a group I or, a group II at best.
https://bobistheoilguy.com/forums/threads/oil-rheology-ii-groff-charts.41181/
The answer is no to your main question. Base oils can refer to any one group-type of oil, or refer to combinations of base oils of various Groups and viscosities that make up a weight grade. However, I know of no one today who uses a single type of base oil for his formulation.
G-MAN and others are correct in that you cannot make a 20W50 from Group III BASE OIL ALONE. It takes a combination of base oils of various viscosities and VII's to make a specific weight grade.
There are literally hunfreds of combinations of various base oils and respective viscosities that can comprise any weight grade (viscosity or viscosity spread) of oil.
In our former 20W50 (alchy) Partial SYnthetic racing oils, we used base oils of PAO's, Esters, and Group II oils, with the Group II's as majority, PAO's as second percentages, and Esters as teriary base oils. The PAO was actually a mix of three different viscositties of various PAO's. We used no VII's.
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