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Engine Oil & Last Century Porsche Road Engines , some light reading

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Engine Oil & Last Century Porsche Road Engines , some light reading

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Old 01-22-2018, 05:31 PM
  #46  
JET951
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O is incorrect ( again ) , 45 deg F = 7.2 deg cel , Porsche printed in the owners manual that came with these last century cars that 20w-50 is quite OK to minus 10 deg cel ( 14 deg F ) , so please " O " ( whatever you actual name is ? ) you have to stop giving out incorrect information

As for a 0w-40 engine oil in a last century Porsche 944 / 951 / 944S2 / 968 engine , what happens when the oil temp reaches operating temp of 90 to 100 deg cel ? , I will tell you what happens , you will damage/ destroy No 2 con-rod bearing at high sustained RPM because the 944 engine will not have sufficient oil pressure to overcome the radially fed crankshaft & to overcome this oil pressure short fall the engine con-rod bearings require sufficient oil PRESSURE ( 20w-50 ) to protect from metal to metal contact & with oil temp of 90 deg cel to 100 deg cel a 0w-40 oil viscosity will not give sufficient oil pressure & made worse as the oil film strength is not up to the application as well

Remember "O" , normal oil temp at high RPM quickly reaches 100 deg cel ( very normal operating temp )

All very basic physics for a very uncomplicated engine
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