Show OIL MAN EXPLAINS S I REAL MEANING OF F i S VISCOSITY Tests of Oils Taken at Normal Nor Nor- J I. I mal Temperatures Are I Declared Declared Declared Misleading Ii t c i Many dealers In oils are in the habit of or speaking of the viscosity of the oils they they handle and using as a a- a sel selling ipg argument argument that if the viscosity Is Is' Is fight ls the oil necessarily must be right too This Is true only If the viscosity is right at t a working temperature As S a matter of fact there is now a controversy raging raging as to the val value e of viscosity t tests and the question Is little lit tle tie understood Upon being asked about the matter W. W F. F Culmer manager of the company which produces the famous Culco oils said I r do not care to be quoted as to my personal views as it would be tantamount tantamount tanta tanta- mount to saying that I know more about the subject than the foremost oil experts of ot America but I will wiH give a a brief synopsis of the points so far tS 55 Brought rought out in the Interesting battle 1 V k of brains between the prom prominent nent oil man n and the several engineers f This controversy was brought about out from the questionable h habit bit of speaking of viscosities in relation to a normal temperature rather than at the working temperature developed In practice So far the only points agreed upon are re that oils of the same viscosity at normal show a great difference at the higher temperature that typify working work- work ing Ong conditions s r That viscosity can be artificially increased by the addition of other sub- sub It It developed that several oils were i t rown out as having suspiciously 1 nigh gh viscosities by a certain engineer I 1 and the oil expert came back by sug- sug 0 Besting gesting that the engineer worked from sug-I sug the wrong hypothesis Comparative viscosity is Indicative only only If taken at operating temperatures S S and oil may show an excellent viscosity vis- vis 5 at normal and will be of very low viscosity under low temperature d The question was asked pointblank if it viscosity is viscosity what difference differenCe difference differ- differ ence does it make to an oil how It gets there It was further asserted that the of an oil taken by a a. stanard stan- stan ard at normal was no Indication of ot Its power to hold its virtue virtue vir vir- tue under extreme working conditions The argument that most nearly meets my views was It is the function of ot a lubricant to come between the lubricating parts and form a film that prevents the metal parts from coming In contact and also presents in in- itself the least frictional resistance The lubricant that best performs this function function tion Is that which retains its cellular or structure after the process of refining a virtue which few oils retain under the usual process of I rapid distillation at high temperature and It is only an oil that still possesses possesse this ball bearing I property that will re retain reO re- tain Its viscosity at high working temperatures temperatures tem tem- and perform Its functions I day after atter day and year year- after year I T I am not going to again harp on my my hobby of using light oils for automobiles automobiles automo automo- biles but I cannot refrain from adding that our laboratory tests and working tests on various Culco oils proves ex exclusively exclusively exclusively ex- ex that Cresta our oil de lu e for lor automobiles meets all the requirements requirements requirements require require- ments of an automobile cylinder arid and we knew what it It- would do under any and all conditions before finally placing placing ing the Culco guarantee on it it offering to Jp refund the entire purchase price if it H did old not prove equal or superior to ny acy other oil at any price purchased on the market |