Advantage: Strong for synthetics
Temperature range: What are the highest and lowest temperatures the oil
can tolerate and provide proper lubrication, for both continuous and
intermittent duty? This range is established by measuring the pour point
(lowest temperature the oil will pour) and the highest temp the oil can hold
sufficient viscosity to lubricate. Chart Two demonstrates the superior
performance of synthetic oils over petroleum oils. A strong temperature
range is paramount to providing proper lubrication, especially in severe duty
or extreme temperatures.
Advantage: Very strong for synthetics
Oxidation stability: How well does the oil resist oxidation and sludge
formation? As oil oxidizes, it thickens and deposits sludge in the engine.