Characterization of Metakaolin from Wassa Kaolin and Its Potential as Adsorbent for the Regeneration of Used Engine Lubrication Oil

Table 2

Shows the pour point values of the virgin lubricant oil, the used lubricant oil, and the metakaolin lubricant oils using [26].

Sample	Pour point ( C)	Viscosity index	Refractive index	Specific gravity
Virgin lubricant oil	−19 ± 1 (a)	115 ± 1 (a)	1.493 ± 0.001 (a)	0.697 ± 0.016 (a)
Used lubricant oil	−18 ± 1 (ab)	94 ± 1 (b)	1.591 ± 0.001 (b)	0.831 ± 0.001 (b)
Metakaolin treated lubricant oil	−15 ± 1 (b)	118 ± 1 (a)	1.413 ± 0.001 (c)	0.721 ± 0.000 (c)