Quote:
Originally Posted by Robert_Nash
A. No one has objectively or scientifically demonstrated "how hot is too hot" with regards to today's engines and engine oil or that the temperatures owners are experiencing are actually a danger to the engine.
B. No one has objectively/scientifically/under controlled circumstances demonstrated when/under what conditions the engine oil temperatures rise.
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To these points specifically though, this graph says a lot about (A):
And as far as (B) goes, the obvious factors that contribute to a higher oil temp are: Time spent at high RPM values, Ambient temp, airflow to the front of the car (and thus vehicle speed), and engine load (uphill worse than downhill, full throttle worse than half throttle, etc).