LUBRICANTS FOR USE IN BOOSTED ENGINES
A lubricating oil composition including greater than 50 wt. % of a base oil, from 100 ppm to less than 1800 ppm by weight of total metal from metal-containing detergent(s) including an overbased calcium detergent and a magnesium containing detergent. The composition has a total nitrogen of 900 ppm to less than 1600 ppm by weight, and a ratio of total metal from the detergent(s) in ppm to the total nitrogen in ppm of less than 1.9. The composition also includes a borated compound to provide greater than 50 ppm by weight to 1000 ppm by weight of boron, and a ppm ratio of metal from the detergent(s) in ppm to the total boron is less than 7.5 and a molybdenum compound to provide greater than 80 ppm to 1200 ppm by weight molybdenum and a ppm ratio of total metal from the detergent(s) to the molybdenum is less than 23.8.
1 . A lubricating oil composition comprising:
greater than 50 wt. % of a base oil of lubricating viscosity and one or more metal-containing detergent(s) including at least one overbased calcium detergent and at least one magnesium containing detergent, each said overbased metal-containing detergent has a total base number greater than 225 mg KOH/g, measured by the method of ASTM D-2896, wherein said lubricating oil composition has from 100 ppm by weight to less than 1800 ppm by weight of total metal from the one or more metal-containing detergent(s);
wherein the lubricating oil composition has a total nitrogen amount of 900 ppm by weight to less than 1600 ppm by weight, and a ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total nitrogen in ppm in the lubricating oil composition is less than 1.9;
a borated compound in an amount sufficient to provide greater than 50 ppm by weight to 1000 ppm by weight of boron to the lubricating oil composition, and a ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total boron in ppm in the lubricating oil composition is less than 7.5; and
an oil soluble molybdenum compound in an amount sufficient to provide greater than 80 ppm by weight to 1200 ppm by weight molybdenum to the lubricating oil composition, and a ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total molybdenum in ppm in the lubricating oil composition is less than 23.8;
the lubricating oil composition has a NOACK volatility as measured by the method of ASTM D-5800 at 250° C. of less than 11.0 wt. %, and the lubricating oil composition is effective to ensure a TCO Temperature Increase of less than 9.0% as measured using the 2015 version of the General Motors Dexos1® Turbocharger Coking Test.
2 . The lubricating oil composition according to claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total nitrogen in ppm in the lubricating oil composition is less than 1.8.
3 . The lubricating oil composition according to claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total boron in ppm in the lubricating oil composition is less than 7.3.
4 . The lubricating oil composition according to claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total molybdenum in ppm in the lubricating oil composition is less than 20.0.
5 . The lubricating oil composition according to claim 1 , wherein the lubricating oil composition has a NOACK volatility as measured by the method of ASTM D-5800 at 250° C. of 2.0 wt. % to less than 11.0 wt. %.
6 . The lubricating oil composition according to claim 1 , wherein the lubricating oil composition is effective to ensure a TCO Temperature Increase of less than 8.0% as measured using the 2015 version of the General Motors Dexos1® Turbocharger Coking Test.
7 . The lubricating oil composition according to claim 1 , wherein the lubricating oil composition has an 0 W-20 rating.
8 . The lubricating oil composition according to claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total nitrogen in ppm in the lubricating oil composition is from 0.1 to 1.7.
9 . The lubricating oil composition according to claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total boron in ppm in the lubricating oil composition is from 0.1 to 7.0.
10 . The lubricating oil composition according to claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total molybdenum in ppm in the lubricating oil composition is from 1.0 to 13.0.
11 . The lubricating oil composition according to claim 1 , wherein the lubricating oil composition is effective to ensure a TCO Temperature Increase of from 1.0% to less than 6.0% as measured using the 2015 version of the General Motors Dexos1® Turbocharger Coking Test.
12 . The lubricating oil composition according to claim 1 , wherein the lubricating oil composition has a NOACK volatility as measured by the method of ASTM D-5800 at 250° C. of 5.0 wt. % to less than 10.9 wt. %.
13 . A method for reducing or preventing formation of deposits in a boosted internal combustion engine comprising steps of:
lubricating a boosted internal combustion engine with the lubricating oil composition of claim 1 , and
operating the engine lubricated with the lubricating oil composition.
14 . The method of claim 12 , wherein the lubricating oil composition is effective to ensure a TCO Temperature Increase of less than 8.0% as measured using the 2015 version of the General Motors Dexos1® Turbocharger Coking Test.
15 . The method of claim 12 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total nitrogen in ppm in the lubricating oil composition is from 0.1 to 1.7.
16 . The method of claim 12 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total boron in ppm in the lubricating oil composition is from 0.1 to 7.0.
17 . The method of claim 12 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total molybdenum in ppm in the lubricating oil composition is from 1.0 to 13.0.
18 . The method of claim 12 , wherein the lubricating oil composition is effective to ensure a TCO Temperature Increase of from 1.0% to less than 6.0% as measured using the 2015 version of the General Motors Dexos1® Turbocharger Coking Test.
19 . The method of claim 12 , wherein the lubricating oil composition has a NOACK volatility as measured by the method of ASTM D-5800 at 250° C. of 5.0 wt. % to less than 10.9 wt. %.