Show CRUDE OIL HAS TWO GENERAL CLASSES I From the the- viewpoint of or the oil refiner er cr declared Jack McDonald sales manager manager manager man man- ager of oC the Star Lubricating Oil compan company company com com- pany pan crude oil Is of two general classes or types namely those oils which carry practically no asphalt and which yield solid lid hydrocarbon of of the tho par series and termed termed base base and those which yield practically no but run heavy in a asphalt tho the asphalt base oils strictly speaking However semi semi- asphalt of mixed base baso oil typified b by certain of the crude oils of or Illinois Kansas Oklahoma and Texas which contaIn contain contain con con- tain both and asphalt and nd are hence a a. combination of ot tho the two other classes It is 18 now tho the practice of or some of oC tho the large American refineries to substitute substitute sub sub- the tho oil for the tho pure Pennsylvania base oil which Is ver very scarce and high tints enabling them to market their products at a much lower price rice than would wold be possible I had the they continued continued to use only tho the pure crude I Mr lr McDonald went nent on to say that the I reputation obtained by tho the products products prod prod- of the Star Lubricating Oil prod prod-I compan company com corn pan pany have ha been built up on quality alone and It Is iii the policy of or the com company pan to maintain this reputation and as long as Pennsylvania baso basc crude Is obtainable obtainable obtainable ob ob- nothing else will enter into tho the manufacture of lubricating oils |