Mineral-base lubricating oils and methods for using same

Claim 1

A LUBRICATING OIL COMPOSITION HAVING A RESINIFICATION INDES LESS THAN 20 MG./5 GR., COMPRISING AT LEAST 75 WEIGHT PERCENT OF A PETROLEUM OIL HAVING AN INITIAL BOILING POINT ABOVE 300*F. AND A FINAL BOILING POINT BELOW 600*F., BOTH AT 10 MM. HG ABS., A VISCOSITYIN THE RANGE OF 50 TO 160 S. U. S. AT 100* F. AND IN THE RANGE OF 33 TO 50 S. U. S. AT 210*F., A POUR POINT BELOW 15*F. AND A RESINIFICATION INDEX LESS THAN 10 MG./5 GR., AND UP TO 25 WEIGHT PERCENT OF ADDITIVES IMPROVING THE PROPERTIES OF SAID COMPOSITION, SAID ADDITIVES INCLUDING THE RANGE OF 1 TO 15 WEIGHT PERCENT OF A VISCOSITY INDEX INPROVER SELECTED FROM THE GROUP CONSISTING OF POLUOFINS HAVING A MOLECULAR WEIGHT IN THE RANGE OF 5,000 TO 50.000 AND POLYMETHACTYLATE ESTER; IN THE RANGE OF 1 TO 15 WEIGHT PERCENT OF A DETERGENT CONSISTING OF A PHOSPHOSULFURIZED HYDROCARBON HAVING A MOLECULAR WEIGHT IN THE RANGE OF 300 TO 30,000 NEUTRILIZED WITH A METAL CONTAINING REAGENT; AND IN THE RANGE OF 0.01 TO 5 WEIGHT PERCENT OF A ZINC DIALKYL DITHIOPHOSPHATE AS AN ANTIOXIDANT.