On-vehicle evaluation of oil formulation

Measuring and testing – Internal combustion engine or related engine system or... – Lubricant condition

Reexamination Certificate

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C073S010000, C073S053050

Reexamination Certificate

active

08082776

ABSTRACT:
This invention is a method for determining the quality of lubrication oil added to a quantity of used oil in an operating engine or mechanism such as occurs during an oil change or when additional oil is added to maintain the vehicle manufacturer's specified total volume of oil. The method is based on identifying the electrical resistivity characteristics of the oil addition, representative of both the base oil formulation and its additive package, and, through comparison with previously-generated resistivity data on multiple oils identifying the oil addition. The added oil may then be compared with manufacturer specifications for the specific application to determine whether it meets recommended manufacturer requirements.

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patent: 2002/0162385 (2002-11-01), Ismail et al.
patent: 2006/0232267 (2006-10-01), Halalay et al.
patent: 2010/0250156 (2010-09-01), Halalay et al.

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