Abstract
This article compares the volatilities of mineral and synthetic oils in automotive and tractor engines, and defines the conditions under which synthetic oils have substantial advantages in volatility over the polymer-compounded mineral oils. The oil vaporization rates in a Petter W-1 single-cylinder carburetor engine is measured by means of a specially developed procedure. The oils used to lubricate automotive and tractor engines in the northern and arctic regions consist of a lowviscosity mineral oil base stock compounded with a polymeric additive. It is determined that the main factor influencing the vaporization of oils in the engine is the distillation range of the oil; that synthetic and mineral oils that are similar in distillation range will vaporize at approximately the same rate; that the rate of oil vaporization depends to a considerable degree on the cylinder temperature; that the advantages of synthetic and semisynthetic oils in volatility in comparison with polymer-compounded mineral oils, will be greater for higher cylinder temperatures; and that the use of synthetic components is advisable in 5W/30 and 10W/30 oils intended for use in engines with upper cylinder temperatures above 150/sup 0/C and in 5W/30, 10W/30, and 15W/30 oils intended for use in engines with upper cylindermore » temperatures of 180-190/sup 0/C.« less
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