1. THE METHOD OF PREPARATION OF A VISCOUS OIL, WHICH COMPRISES: CONDENSING, AT A TEMPERATURE BETWEEN ABOUT 400*F. AND ABOUT 750*F. FOR A PERIOD OF TIME FROM ABOUT TEN HOURS TO ABOUT ONE HOUR, RESPECTIVELY, ONE MOLAR PROPORTION OF A STRAIGHT CHAIN, ALPHA MONO-OLEFIN HAVING FROM 5 TO 18 CARBON ATOMS PER MOLECULE, FROM ABOUT 0.01 TO ABOUT ONE MOLAR PROPORTION OF A CONJUGATED HYDROCARBON AND FROM ABOUT 0.001 TO ABOUT ONE MOLAR PROPORTION OF A SUBSTNACE SELECTED FROM THE GROUP CONSISTING OF SULFUR, SELENIUM AND TELLURIUM; SAID CONJUGATED HYDROCARBON BEING CHARACTERIZED BY AT LEAST ONE

14. A VISCOUS OIL COMPOSITION COMPRISING A MINERAL OIL OF LUBRICATING VISCOSITY IN MAJOR PROPORTION AND A MINOR PROPORTION, FROM ABOUT ONE TO ABOUT TEN PER CENT, OF A CONDENSATION PRODUCT; SAID CONDENSANTION PRODUCT BEING OBTAINED BY: CONDENSING, AT A TEMPERATURE BETWEEN ABOUT 400*F. AND ABOUT 750*F. FOR A PERIOD OF TIME FROM ABOUT TEN HOURS TO ABOUT ONE HOUR, RESPECTIVELY, ONE MOLAR PROPORTION OF A STRAIGHT CHAIN, ALPHA MONOOLEFIN HAVING FROM FIVE TO EIGHTEEN CARBON ATOMS PER MOLECULE, FROM ABOUT 0.01 TO ABOUT ONE MOLAR PROPORTION OF A CONJUGATED HYDROCARBON AND FROM ABOUR 0.001 TO ABOUT ONE MOLAR PROPORTION OF SULFUR; SAID CONJUGATED HYDROCARBON BEING CHARACTERIZED BY AT LEAST ONE