Re-refining Used Engine Oil in Ghana Using Solvent Extraction and Acid-Clay Treatment

Table 3

Typical specification of different classes of engine oil according to the Society of Automotive Engineers (SAE) classification.

Specification	Unit	SAE 30	SAE 40
Viscosity index (VI)	—	95	97
Density at 15°C	g/cm^3	0.895	0.898
Pour point	°C	−18	−15

The above values may vary within commercially acceptable tolerances.