Lubricating Oil Composition

Abstract

Oil composition comprising a base oil component having viscosity index of greater than 120, a sulphur content of below 0.03 wt %, and a saturates content of greater than 98 wt % and an additive, wherein the base oil component has a paraffin content of greater than 80 wt % and comprises a series of iso-paraffins having n, n+1, n+2, n+3 and n+4 carbon atoms and =10 wherein n is between 20 and 40 and wherein the oil composition comprises more than 0.2 wt % of a sterically hindered phenolic type antioxidant.

1 . An oil composition comprising a base oil component having a viscosity index of greater than 120, a sulphur content of below 0.03 wt %, and a saturates content of greater than 98 wt % and an additive, wherein the base oil component has a paraffin content of greater than 80 wt % and comprises a series of iso-paraffins having n, n+1, n+2, n+3 and n+4 carbon atoms and wherein n is between 20 and 40 and wherein the oil composition comprises more than 0.2 wt % of a sterically hindered phenolic type anti-oxidant. 
   
   
       2 . The oil composition according to  claim 1 , wherein the concentration of the sterically hindered phenolic type anti-oxidant is greater than 0.4 wt %. 
   
   
       3 . The oil composition according to  claim 1 , wherein the concentration of the sterically hindered phenolic type anti-oxidant is less than 2 wt %. 
   
   
       4 . The oil composition according to  claim 1 , wherein the base oil has a pour point of below −15° C. 
   
   
       5 . The oil composition according to  claim 1 , wherein the base oil is prepared by hydroisomerisation of a Fischer-Tropsch derived wax. 
   
   
       6 . The oil composition according to  claim 1 , wherein the sterically hindered phenolic type anti-oxidant is selected from the group consisting of 4,4-methylene bis-2,6-ditertiarybutyl phenol, 3-t-butyl-4-methoxyphenol, 2,5-di-t-butylhydroquinone, n-octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)proprionate, 2,2′-methylenebis(4-methyl-6-t-butylphenol), 2,2′-methylenebis(3-methyl-6-t-butylphenol), 4,4′-butylidenebis(4-ethyl-6-t-butylphenol),
 4,4′-methylenebis(2,6-t-butylphenol), 2,2-(di-p-hydroxyphenyl)propane, hexamethyleneglycol bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)priopionate], triethyleneglycol bis[3-(3-t-butyl-4-hydroxy-5-methylphenyl)priopionate], 2,2′-thio-[diethyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)priopionate], and 3,9-bis{1,1-dimethyl-2-[3-(3-t-butyl-4-hydroxy-5-methylphenyl)proprionyloxy]-ethyl}-2,4,8,10-tetraoxospiro[5,5]undecane.   
   
   
       7 . (canceled)