Some of the makers and sellers of synthetic oils talk about the demanding requirements of aircraft turbine oil. Here is some info on turbine oil used on aircraft. The operating limits on oil temps for the C130 with MIL-L-23699, http://msds.ogden.disa.mil/msds/owa/web_msds.display?imsdsnr=4373 a Polyol Ester are; Normal temp range 60-85 degree C, 85-100 for no longer than 30 minutes, if oil temp exceeds 100 degrees for 5 minutes it is an engine shutdown condition. If oil temp is observed to exceed 150 degree, drain and system flush and sump plug inspection is required, with follow up inspection of magnetic sump plugs 100 hours later. So you can see that automobile and truck engines are much harder on oil than aircraft are. From an army Chopper flight manual;LOW ENGINE OIL PRESSURE/HIGH ENGINE OIL TEMPERATURE If the engine oil pressure is below 50 PSI or the temperature is above 107 degC - Land as soon as possible.