06920779 is referenced by 35 patents and cites 11 patents.

A motor vehicle having an internal combustion engine and a lubricating oil circulation system provides estimates of the distance remaining before an oil change becomes imperative. An indirect estimate of the depletion of various additives and the deterioration of oil operating characteristics is based on engine operating variables including oil temperature, ignition timing and engine load. The limit of depletion of total base number is dynamic, since it is set against total acid number and the two figures are independently calculated.

Title
Method of estimating engine lubricant condition
Application Number
10/295360
Publication Number
6920779 (B2)
Application Date
November 15, 2002
Publication Date
July 26, 2005
Inventor
Frank Bondarowicz
Park Ridge
IL, US
Gerald L Larson
Fort Wayne
IN, US
Kevin R Carlstrom
Fort Wayne
IN, US
Agent
Susan L Lukasik
Dennis Kelly Sullivan
Jeffrey P Calfa
Assignee
International Truck Intellectual Property Company
IL, US
IPC
G01M 015/00
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