Originally Posted By: riggaz
Originally Posted By: edyvw
Quote:
The oil temperature at -30C would be vehicle specific
So wait. Your claim is that at -30, if you drive 100kph you oil will not reach operating temp?
At -30 the wind chill on his diff and sump @ 70mph will be very, very bad so I'd say he is absolutely correct. That's why manufacturers usually give oil recommendations based on ambient temps because they know this happens.
So while your statement that at operating temp they are the same is true, his oils will never get to full operating temp due to his ambient temps.
That is interesting, considering that all cars that I drove and had oil temp. gauge, always reached operating temp even in colder weather.
All cars that I had, that were produced after 1990 had skid plate to protect sump, hoses, etc. Also, there is heat exchanger.
On short distances, of course it will not reach temp, but if you drive longer sure it will, especially in German cars that love to run hot.