Quote:
Originally Posted by Daox
If you have oil pressure you're pretty much fine to floor it. So, a few seconds at most after starting the engine? Having thinner oil actually protects things a bit worse. Thinner oil mainly is used to increase efficiency.
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So there is no harm in running a cold engine hard? I have heard that pushing it hard with cold oil is terrible for the life of the engine because it may be too thick to flow adequately and because the clearances are incorrect at below operating temps. Here is one article about why it’s bad. I don’t know how true it is, but there must be some truth to it since Honda engines won’t activate VTEC until the coolant is warmed up and some engines have a variable redline that goes up as the engine heats up.
Keep Your Engine Alive: The Importance of Oil Temperature | Tuner University