Method for deconditioning an engine used in fuel economy tests
AssigneeExxon Research & Engineering Co.
InventorsHarold Shaub, Joseph M. Pecoraro
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Abstract
A method for deconditioning an engine used in evaluating the fuel economy derived from lubricating oils wherein a deconditioning oil is added to the engine after removal of the test lubricating oil, the deconditioning oil comprising a lubricating oil composition containing a selected overbased metal salt or a selected neutral metal salt, the salt being selected from the group consisting of alkali metal or alkaline earth metal sulfonates, phenates, phosphonates and thiophosphonates.
Claims14
A method for deconditioning an engine used in fuel economy tests for a lubricating oil comprising replacing a test lubricating oil after it is tested in said engine with a deconditioning oil composition comprising a lubricating base oil containing an overbased alkali or alkaline earth metal compound selected from the group consisting of sulfonates, phenates, phosphonates and thiophosphonates in an amount sufficient to give the deconditioning oil a total base number of about 15 to about 100 or a neutral alkali or alkaline earth metal compound selected from the group consisting of sulfonates, phenates, phosphonates and thiophosphonates in an amount of at least 5% by weight.
In the method for measuring the fuel economy of an engine lubricated with a lubricating oil wherein the fuel economy of a test lubricating oil is compared with the fuel economy of a reference oil, the improvement wherein the engine is deconditioned after being exposed to the test lubricating oil with a deconditioning oil comprising a lubricating base oil containing an overbased alkali or alkaline earth metal compound selected from the group consisting of sulfonates, phenates, phosphonates and thiophosphonates in an amount sufficient to give the deconditioning oil a total base number of about 15 to about 100.
Dependencies are inferred from the claim text.