Texaco Inc.

Terence B Jordan

David R McCoy

Abraham Morduchowitz

Isaac D Rubin

Frank K Ward

A tetrapolymer of a first alkyl methacrylate of the formula: ##STR1## a second alkyl methacrylate of the formula: ##STR2## a third alkyl methacrylate of the formula: ##STR3## and a N, N-dialkylaminoalkyl methacrylamide of the formula: ##STR4## where R is alkyl of from 1 to 5 carbons, R.sup.1 is alkyl of from 10 to 15 carbons, R.sup.2 is alkyl of from 16 to 20 carbons, R.sup.3 and R.sup.4 are alkyl of from 1 to 2 carbons and A is a divalent alkylene radical of from 2 to 4 carbons, and hydrocarbon lubricating oil compositions containing dispersant and VI improving amounts of said tetrapolymer.

Multifunctional tetrapolymer lube oil additive

Method of preparing a tetraalkyl-tetraoxaundecane by the reaction of a C.sub.10 - C.sub.16 aliphatic ketone with pentaerythritol in the presence of an active acid catalyst in an inert solvent at 120.degree.-150.degree.C. for 8 to 70 hours.

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Fishkill, NY, United States of America

Terence B Jordan