Patent ID: 7875579

Claim:
A lubricant composition which comprises at least 50 wt % of a lubricating base oil and an oil-soluble metal compound providing between about 100 and about 1680 parts per million of metal to the lubricant composition, the metal compound being chosen from the group consisting of molybdenum, tungsten, titanium and boron compounds, and an oil-soluble first hindered amine providing between about 0.5 and about 1.5 wt % of oil-soluble hindered amine to the lubricant composition, wherein the first hindered amine is one or more chosen from the group consisting of: (a) a compound of the formula where R 26 is H, O or a hydrocarbon from 1 to 25 carbon atoms, an alkoxy radical with the oxygen bound to the nitrogen with the alkyl portion containing 1 to 25 carbon atoms, or a COR group, the R being a hydrocarbon containing from 1 to 25 carbon atoms; R 27 , R 28 , R 32 , R 33 are hydrocarbons with 1 to 25 carbon atoms; R 29 , R 31 are H or hydrocarbons with 1 to 25 carbon atoms; when n=1, R 30 is OH, H, O, NH 2 , NR 2 where R is a hydrocarbon with 1 to 25 carbon atoms, an ester group O 2 CR where R is a hydrocarbon with 1 to 25 carbon atoms, or a succinimide group; when n=2, R 30 is the diacyl radical of an aliphatic dicarboxylic acid having 4 to 12 carbon atoms; (b) 4-stearoyloxy-2,2,6,6-tetramethylpiperidine, (c) di(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, (d) di(1,2,2,6,6-pentamethylpiperidin-4-yl) sebacate, (e) bis (1-octyloxy-2,2,6,-tetramethyl-4-piperidyl) sebacate (f) polymer-bound piperidine compound, (g) a compound of the group consisting of 2,2,6,6-tetramethylpiperidines, 1,2,2,6,6-pentamethylpiperidines, 1-oxo-2,2,6,6-tetramethylpiperidines, and 1-alkoxy-2,2,6,6-tetramethylpiperidines, and (h) a compound of the group consisting of di(1,2,2,6,6-pentamethylpiperidin-4-yl) sebacate, 4-stearoyloxy-2,2,6,6-tetramethylpiperidine, di(,2,2,6,6-tetramethylpiperidin-4-yl) sebacate and bis (1-octyloxy-2,2,6,-tetramethyl-4-piperidyl) sebacate.