Synthetic Oil FAQ
Learn about conventional vs synthetic oil, grades, viscosity, alkalinity, TBN, flash point, shear stability, multi weight, and the best synthetic oil qualities.
What is Synthetic Oil?
E.G. Waxes are present in crude-based oil, but contribute nothing to the lubricating ability of oil which is true of the hydrocarbon molecules also found in crude. Synthetic oil does not contain such contaminants. In synthetic motor oil, hydrocarbon molecules are uniform, giving it exceptional properties consistent at high and low engine temperatures.
How Many Grades of Oil are There?
- Group I and Group II – mineral oils commonly known as “conventional oils” which are derived from processed crude oil.
- Group III – this is a more highly refined mineral oil made through a process called hydrocracking. In North America this group is considered a synthetic oil due to the processes involved.
- Group IV – this is synthetic oil, known as Polyalphaolefin (PAO).
- Group V – this is synthetic stock oil other than PAO’s and include esters and other compounds.
What is the Significance of the Viscosity Index Grading?
The structure of synthetic oil resists changes in viscosity with temperature changes and does not require Viscosity Improvers. This is one reason synthetic oil last so much longer than non-synthetics. The physical property method used universally to quantify an oil’s resistance to viscosity change with temperature is the Viscosity Index.
What is the Viscosity Index of OnGuard Oil?
What does an oil's TBN relate to?
What is meant by an oil's flash point?
What is Shear Stability?
Why does engine oil have multi weights?
The first number describes how the engine oil flows when cold. ’10W’ indicates that the oil behaves as a 10 weight oil when cold. Non-synthetic oils achieve this behavior with additives. But synthetic oil can achieve 5W or even 0W ratings.