Why Synthetic Oil is So Good

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From, "SYNTHETIC OIL: Rx FOR LONG ENGINE LIFE"
~ Curt Scott, "The Complete Guide To Specialty Cars"

The remarkable ability of synthetic oils to reduce internal operating temperatures is far too important to ignore, since high operating temperatures contribute directly to premature failure of mechanical components and gaskets and seals. Coolant, (i.e. water/antifreeze), cools only the upper regions of an engine. The task of cooling the crankshaft, main and connecting rod bearings, the timing gear and chain, the camshaft and its bearings must be borne entirely by the oil.

There are three identifiable reasons why synthetics do a better job of cooling an engine:

  1. Because of both the oil's lubricity, (slipperiness), and its stable viscosity, less friction - and thus less heat - is generated in the first place;
  2. The molecular structure of the oil itself is designed to more efficiently transfer heat, even compared against the thermal conductivity properties, (ability to absorb and dissipate heat), of an identical viscosity petroleum oil;
  3. As mentioned in the preceding paragraph, the more rapid oil flow of these lower-viscosity synthetics contributes significantly to the efficient transfer and dissipation of heat. Because of all these factors, oil temperature decreases of from 20 deg. F to 50 deg. F are quite common with the use of synthetic oil. One might even say that the heat-reduction properties of synthetics are synergistic...by helping to reduce its own temperature, the synthetic oil is simultaneously enhancing the lubricant's overall performance characteristics.