US 12,031,101 B2
Relating to lubricating compositions
Gregory Stidder, Wantage (GB); Robert W. Shaw, Abingdon (GB); and Simon Crick, Wallingford (GB)
Assigned to Infineum International Limited, Abingdon (GB)
Filed by Infineum International Limited, Abingdon (GB)
Filed on Feb. 21, 2018, as Appl. No. 15/900,842.
Claims priority of application No. 17157432 (EP), filed on Feb. 22, 2017.
Prior Publication US 2018/0237718 A1, Aug. 23, 2018
Int. Cl. C10M 169/00 (2006.01); C10M 101/00 (2006.01); C10M 129/54 (2006.01); C10M 139/04 (2006.01); C10M 141/12 (2006.01); C10M 155/02 (2006.01); C10M 169/04 (2006.01); C10N 30/04 (2006.01); C10N 40/25 (2006.01)
CPC C10M 141/12 (2013.01) [C10M 101/00 (2013.01); C10M 129/54 (2013.01); C10M 139/04 (2013.01); C10M 155/02 (2013.01); C10M 169/044 (2013.01); C10M 2203/003 (2013.01); C10M 2207/129 (2013.01); C10M 2207/144 (2013.01); C10M 2215/064 (2013.01); C10M 2215/28 (2013.01); C10M 2227/02 (2013.01); C10M 2227/04 (2013.01); C10M 2229/041 (2013.01); C10M 2229/042 (2013.01); C10M 2229/046 (2013.01); C10M 2229/047 (2013.01); C10M 2229/052 (2013.01); C10N 2030/04 (2013.01); C10N 2040/255 (2020.05)] 45 Claims
OG exemplary drawing
 
1. A lubricating oil composition comprising a base oil of lubricating viscosity, one or more calcium containing detergents, and one or more silicone containing compounds, wherein:
i) the one or more calcium containing detergents comprise a combination of a calcium salicylate detergent having a TBN of at least 64 mg KOH/g and a calcium salicylate detergent having a TBN of at least 220 mg KOH/g and the combination provides the lubricating oil composition with a calcium content of 0.184 wt. %, based on the weight of the lubricating oil composition,
ii) the one or more silicone containing compounds provide the lubricating oil composition with a silicon content of about 20 to about 110 ppm by weight, based on the weight of the lubricating oil composition and are selected from the group consisting of polydimethylsiloxane, tetraethyl orthosilicate (Si(OEt)4), tetraethylsilane (Si(C2H5)4), tetrabutylorthosilicate (Si(OC4H9)4) and octamethylcyclotetrasilazane (C8H28N4Si4), and
iii) when the lubricating oil composition is used to lubricate the crankcase of a direct injection-spark ignition internal combustion engine, the frequency of low-speed pre-ignition events is reduced as compared to the lubricating oil composition having less than or equal to 12 ppm by weight silicon content.