The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2019
Filed:
May. 05, 2016
Afton Chemical Corporation, Richmond, VA (US);
Kristin Fletcher, Midlothian, VA (US);
William Y. Lam, Glen Allen, VA (US);
Kongsheng Yang, Glen Allen, VA (US);
Jeremy Styer, Glen Allen, VA (US);
AFTON CHEMICAL CORPORATION, Richmond, VA (US);
Abstract
A lubricating oil composition and method of for providing an acceptable number of low-speed pre-ignition events in a boosted internal combustion engine using the lubricating oil composition. The lubricating oil composition includes greater than 50 wt. % of a base oil of lubricating viscosity, and an additive composition that includes an overbased calcium-containing detergent having a TBN greater than 225 mg KOH/g, and one or more zinc dialkyl dithiophosphate compounds are derived from a molar ratio of secondary alcohol to primary alcohol of 20:100 to about 100:0 and have an average total carbon content of greater than 10 carbon atoms per mole of phosphorous. The lubricating oil compositions contains the overbased calcium-containing detergent in an amount to provide greater than 900 ppm to less than 2400 ppm by weight calcium, and at least 0.01 wt. % of the zinc dialkyl dithiophosphate, both amounts based on the total weight of the lubricating oil composition.