US 12,391,897 B2
Lubricating oil composition
Kenji Sunahara, Tsukuba (JP); and Shoichiro Fujita, Chiba (JP)
Assigned to IDEMITSU KOSAN CO., LTD., Chiyoda-ku (JP)
Appl. No. 17/788,656
Filed by IDEMITSU KOSAN CO., LTD., Chiyoda-ku (JP)
PCT Filed Dec. 24, 2020, PCT No. PCT/JP2020/048567
§ 371(c)(1), (2) Date Jun. 23, 2022,
PCT Pub. No. WO2021/132518, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 2019-239443 (JP), filed on Dec. 27, 2019.
Prior Publication US 2023/0051184 A1, Feb. 16, 2023
Int. Cl. C10M 135/18 (2006.01); C10M 125/22 (2006.01); C10M 129/52 (2006.01); C10M 129/54 (2006.01); C10M 133/06 (2006.01); C10M 137/10 (2006.01); C10M 169/04 (2006.01); C10N 10/04 (2006.01); C10N 10/12 (2006.01); C10N 30/00 (2006.01); C10N 30/02 (2006.01); C10N 30/04 (2006.01); C10N 40/25 (2006.01)
CPC C10M 135/18 (2013.01) [C10M 125/22 (2013.01); C10M 129/52 (2013.01); C10M 129/54 (2013.01); C10M 133/06 (2013.01); C10M 137/10 (2013.01); C10M 169/04 (2013.01); C10M 2201/084 (2013.01); C10M 2207/142 (2013.01); C10M 2207/144 (2013.01); C10M 2215/04 (2013.01); C10M 2219/068 (2013.01); C10M 2223/045 (2013.01); C10N 2010/04 (2013.01); C10N 2010/12 (2013.01); C10N 2030/02 (2013.01); C10N 2030/04 (2013.01); C10N 2030/52 (2020.05); C10N 2030/54 (2020.05); C10N 2040/255 (2020.05)] 20 Claims
 
1. A lubricating oil composition, comprising:
a base oil (A);
a metal-based detergent (B) comprising a calcium-based detergent (B1) and a magnesium-based detergent (B2); and
a molybdenum compound (D) comprising a molybdenum dithiocarbamate (D1), and a molybdenum dithiophosphate (D2) and/or a dialkylamine molybdate (D3),
wherein a content of one or more selected from base oils classified into Groups 2 and 3 in the base oil category of the American Petroleum Institute (API) is 85% by mass or more, based on total lubricating oil composition mass,
wherein the lubricating oil composition has a content of Mo atoms derived from the molybdenum compound (D) of 0.05% by mass or more, based on total lubricating oil composition mass,
wherein the lubricating oil composition has a base number measured by a hydrochloric acid method of 4.0 mg KOH/g or more, and
wherein the lubricating oil composition has an HTHS viscosity at 150° C. in a range of from 1.3 to less than 2.3 mPa·s.